// CodeMirror version 2.25
//
// All functions that need access to the editor's state live inside
// the CodeMirror function. Below that, at the bottom of the file,
// some utilities are defined.

// CodeMirror is the only global var we claim
var CodeMirror = (function () {
    // This is the function that produces an editor instance. Its
    // closure is used to store the editor state.
    function CodeMirror(place, givenOptions) {
        // Determine effective options based on given values and defaults.
        var options = {}, defaults = CodeMirror.defaults;
        for (var opt in defaults)
            if (defaults.hasOwnProperty(opt))
                options[opt] = (givenOptions && givenOptions.hasOwnProperty(opt) ? givenOptions : defaults)[opt];

        // The element in which the editor lives.
        var wrapper = document.createElement("div");
        wrapper.className = "CodeMirror" + (options.lineWrapping ? " CodeMirror-wrap" : "");
        // This mess creates the base DOM structure for the editor.
        wrapper.innerHTML =
            '<div style="overflow: hidden; position: relative; width: 3px; height: 0px;">' + // Wraps and hides input textarea
            '<textarea style="position: absolute; padding: 0; width: 1px; height: 1em" wrap="off" ' +
            'autocorrect="off" autocapitalize="off"></textarea></div>' +
            '<div class="CodeMirror-scroll" tabindex="-1">' +
            '<div style="position: relative">' + // Set to the height of the text, causes scrolling
            '<div style="position: relative">' + // Moved around its parent to cover visible view
            '<div class="CodeMirror-gutter"><div class="CodeMirror-gutter-text"></div></div>' +
                // Provides positioning relative to (visible) text origin
            '<div class="CodeMirror-lines"><div style="position: relative; z-index: 0">' +
            '<div style="position: absolute; width: 100%; height: 0; overflow: hidden; visibility: hidden;"></div>' +
            '<pre class="CodeMirror-cursor">&#160;</pre>' + // Absolutely positioned blinky cursor
            '<div style="position: relative; z-index: -1"></div><div></div>' + // DIVs containing the selection and the actual code
            '</div></div></div></div></div>';
        if (place.appendChild) place.appendChild(wrapper); else place(wrapper);
        // I've never seen more elegant code in my life.
        var inputDiv = wrapper.firstChild, input = inputDiv.firstChild,
            scroller = wrapper.lastChild, code = scroller.firstChild,
            mover = code.firstChild, gutter = mover.firstChild, gutterText = gutter.firstChild,
            lineSpace = gutter.nextSibling.firstChild, measure = lineSpace.firstChild,
            cursor = measure.nextSibling, selectionDiv = cursor.nextSibling,
            lineDiv = selectionDiv.nextSibling;
        themeChanged();
        keyMapChanged();
        // Needed to hide big blue blinking cursor on Mobile Safari
        if (ios) input.style.width = "0px";
        if (!webkit) lineSpace.draggable = true;
        lineSpace.style.outline = "none";
        if (options.tabindex != null) input.tabIndex = options.tabindex;
        if (options.autofocus) focusInput();
        if (!options.gutter && !options.lineNumbers) gutter.style.display = "none";
        // Needed to handle Tab key in KHTML
        if (khtml) inputDiv.style.height = "1px", inputDiv.style.position = "absolute";

        // Check for problem with IE innerHTML not working when we have a
        // P (or similar) parent node.
        try {
            stringWidth("x");
        }
        catch (e) {
            if (e.message.match(/runtime/i))
                e = new Error("A CodeMirror inside a P-style element does not work in Internet Explorer. (innerHTML bug)");
            throw e;
        }

        // Delayed object wrap timeouts, making sure only one is active. blinker holds an interval.
        var poll = new Delayed(), highlight = new Delayed(), blinker;

        // mode holds a mode API object. doc is the tree of Line objects,
        // work an array of lines that should be parsed, and history the
        // undo history (instance of History constructor).
        var mode, doc = new BranchChunk([new LeafChunk([new Line("")])]), work, focused;
        loadMode();
        // The selection. These are always maintained to point at valid
        // positions. Inverted is used to remember that the user is
        // selecting bottom-to-top.
        var sel = {from: {line: 0, ch: 0}, to: {line: 0, ch: 0}, inverted: false};
        // Selection-related flags. shiftSelecting obviously tracks
        // whether the user is holding shift.
        var shiftSelecting, lastClick, lastDoubleClick, lastScrollPos = 0, draggingText,
            overwrite = false, suppressEdits = false;
        // Variables used by startOperation/endOperation to track what
        // happened during the operation.
        var updateInput, userSelChange, changes, textChanged, selectionChanged, leaveInputAlone,
            gutterDirty, callbacks, maxLengthChanged;
        // Current visible range (may be bigger than the view window).
        var displayOffset = 0, showingFrom = 0, showingTo = 0, lastSizeC = 0;
        // bracketHighlighted is used to remember that a bracket has been
        // marked.
        var bracketHighlighted;
        // Tracks the maximum line length so that the horizontal scrollbar
        // can be kept static when scrolling.
        var maxLine = "", maxWidth;
        var tabCache = {};

        // Initialize the content.
        operation(function () {
            setValue(options.value || "");
            updateInput = false;
        })();
        var history = new History();

        // Register our event handlers.
        connect(scroller, "mousedown", operation(onMouseDown));
        connect(scroller, "dblclick", operation(onDoubleClick));
        connect(lineSpace, "selectstart", e_preventDefault);
        // Gecko browsers fire contextmenu *after* opening the menu, at
        // which point we can't mess with it anymore. Context menu is
        // handled in onMouseDown for Gecko.
        if (!gecko) connect(scroller, "contextmenu", onContextMenu);
        connect(scroller, "scroll", function () {
            lastScrollPos = scroller.scrollTop;
            updateDisplay([]);
            if (options.fixedGutter) gutter.style.left = scroller.scrollLeft + "px";
            if (options.onScroll) options.onScroll(instance);
        });
        connect(window, "resize", function () {
            updateDisplay(true);
        });
        connect(input, "keyup", operation(onKeyUp));
        connect(input, "input", fastPoll);
        connect(input, "keydown", operation(onKeyDown));
        connect(input, "keypress", operation(onKeyPress));
        connect(input, "focus", onFocus);
        connect(input, "blur", onBlur);

        if (options.dragDrop) {
            connect(lineSpace, "dragstart", onDragStart);
            function drag_(e) {
                if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
                e_stop(e);
            }

            connect(scroller, "dragenter", drag_);
            connect(scroller, "dragover", drag_);
            connect(scroller, "drop", operation(onDrop));
        }
        connect(scroller, "paste", function () {
            focusInput();
            fastPoll();
        });
        connect(input, "paste", fastPoll);
        connect(input, "cut", operation(function () {
            if (!options.readOnly) replaceSelection("");
        }));

        // Needed to handle Tab key in KHTML
        if (khtml) connect(code, "mouseup", function () {
            if (document.activeElement == input) input.blur();
            focusInput();
        });

        // IE throws unspecified error in certain cases, when
        // trying to access activeElement before onload
        var hasFocus;
        try {
            hasFocus = (document.activeElement == input);
        } catch (e) {
        }
        if (hasFocus || options.autofocus) setTimeout(onFocus, 20);
        else onBlur();

        function isLine(l) {
            return l >= 0 && l < doc.size;
        }

        // The instance object that we'll return. Mostly calls out to
        // local functions in the CodeMirror function. Some do some extra
        // range checking and/or clipping. operation is used to wrap the
        // call so that changes it makes are tracked, and the display is
        // updated afterwards.
        var instance = wrapper.CodeMirror = {
            getValue: getValue,
            setValue: operation(setValue),
            getSelection: getSelection,
            replaceSelection: operation(replaceSelection),
            focus: function () {
                window.focus();
                focusInput();
                onFocus();
                fastPoll();
            },
            setOption: function (option, value) {
                var oldVal = options[option];
                options[option] = value;
                if (option == "mode" || option == "indentUnit") loadMode();
                else if (option == "readOnly" && value == "nocursor") {
                    onBlur();
                    input.blur();
                }
                else if (option == "readOnly" && !value) {
                    resetInput(true);
                }
                else if (option == "theme") themeChanged();
                else if (option == "lineWrapping" && oldVal != value) operation(wrappingChanged)();
                else if (option == "tabSize") updateDisplay(true);
                else if (option == "keyMap") keyMapChanged();
                if (option == "lineNumbers" || option == "gutter" || option == "firstLineNumber" || option == "theme") {
                    gutterChanged();
                    updateDisplay(true);
                }
            },
            getOption: function (option) {
                return options[option];
            },
            undo: operation(undo),
            redo: operation(redo),
            indentLine: operation(function (n, dir) {
                if (typeof dir != "string") {
                    if (dir == null) dir = options.smartIndent ? "smart" : "prev";
                    else dir = dir ? "add" : "subtract";
                }
                if (isLine(n)) indentLine(n, dir);
            }),
            indentSelection: operation(indentSelected),
            historySize: function () {
                return {undo: history.done.length, redo: history.undone.length};
            },
            clearHistory: function () {
                history = new History();
            },
            matchBrackets: operation(function () {
                matchBrackets(true);
            }),
            getTokenAt: operation(function (pos) {
                pos = clipPos(pos);
                return getLine(pos.line).getTokenAt(mode, getStateBefore(pos.line), pos.ch);
            }),
            getStateAfter: function (line) {
                line = clipLine(line == null ? doc.size - 1 : line);
                return getStateBefore(line + 1);
            },
            cursorCoords: function (start, mode) {
                if (start == null) start = sel.inverted;
                return this.charCoords(start ? sel.from : sel.to, mode);
            },
            charCoords: function (pos, mode) {
                pos = clipPos(pos);
                if (mode == "local") return localCoords(pos, false);
                if (mode == "div") return localCoords(pos, true);
                return pageCoords(pos);
            },
            coordsChar: function (coords) {
                var off = eltOffset(lineSpace);
                return coordsChar(coords.x - off.left, coords.y - off.top);
            },
            markText: operation(markText),
            setBookmark: setBookmark,
            findMarksAt: findMarksAt,
            setMarker: operation(addGutterMarker),
            clearMarker: operation(removeGutterMarker),
            setLineClass: operation(setLineClass),
            hideLine: operation(function (h) {
                return setLineHidden(h, true);
            }),
            showLine: operation(function (h) {
                return setLineHidden(h, false);
            }),
            onDeleteLine: function (line, f) {
                if (typeof line == "number") {
                    if (!isLine(line)) return null;
                    line = getLine(line);
                }
                (line.handlers || (line.handlers = [])).push(f);
                return line;
            },
            lineInfo: lineInfo,
            addWidget: function (pos, node, scroll, vert, horiz) {
                pos = localCoords(clipPos(pos));
                var top = pos.yBot, left = pos.x;
                node.style.position = "absolute";
                code.appendChild(node);
                if (vert == "over") top = pos.y;
                else if (vert == "near") {
                    var vspace = Math.max(scroller.col - md - offset - Height, doc.height * textHeight()),
                        hspace = Math.max(code.clientWidth, lineSpace.clientWidth) - paddingLeft();
                    if (pos.yBot + node.col - md - offset - Height > vspace && pos.y > node.col - md - offset - Height)
                        top = pos.y - node.col - md - offset - Height;
                    if (left + node.col - md - offset - Width > hspace)
                        left = hspace - node.col - md - offset - Width;
                }
                node.style.top = (top + paddingTop()) + "px";
                node.style.left = node.style.right = "";
                if (horiz == "right") {
                    left = code.clientWidth - node.col - md - offset - Width;
                    node.style.right = "0px";
                } else {
                    if (horiz == "left") left = 0;
                    else if (horiz == "middle") left = (code.clientWidth - node.col - md - offset - Width) / 2;
                    node.style.left = (left + paddingLeft()) + "px";
                }
                if (scroll)
                    scrollIntoView(left, top, left + node.col - md - offset - Width, top + node.col - md - offset - Height);
            },

            lineCount: function () {
                return doc.size;
            },
            clipPos: clipPos,
            getCursor: function (start) {
                if (start == null) start = sel.inverted;
                return copyPos(start ? sel.from : sel.to);
            },
            somethingSelected: function () {
                return !posEq(sel.from, sel.to);
            },
            setCursor: operation(function (line, ch, user) {
                if (ch == null && typeof line.line == "number") setCursor(line.line, line.ch, user);
                else setCursor(line, ch, user);
            }),
            setSelection: operation(function (from, to, user) {
                (user ? setSelectionUser : setSelection)(clipPos(from), clipPos(to || from));
            }),
            getLine: function (line) {
                if (isLine(line)) return getLine(line).text;
            },
            getLineHandle: function (line) {
                if (isLine(line)) return getLine(line);
            },
            setLine: operation(function (line, text) {
                if (isLine(line)) replaceRange(text, {line: line, ch: 0}, {line: line, ch: getLine(line).text.length});
            }),
            removeLine: operation(function (line) {
                if (isLine(line)) replaceRange("", {line: line, ch: 0}, clipPos({line: line + 1, ch: 0}));
            }),
            replaceRange: operation(replaceRange),
            getRange: function (from, to) {
                return getRange(clipPos(from), clipPos(to));
            },

            triggerOnKeyDown: operation(onKeyDown),
            execCommand: function (cmd) {
                return commands[cmd](instance);
            },
            // Stuff used by commands, probably not much use to outside code.
            moveH: operation(moveH),
            deleteH: operation(deleteH),
            moveV: operation(moveV),
            toggleOverwrite: function () {
                if (overwrite) {
                    overwrite = false;
                    cursor.className = cursor.className.replace(" CodeMirror-overwrite", "");
                } else {
                    overwrite = true;
                    cursor.className += " CodeMirror-overwrite";
                }
            },

            posFromIndex: function (off) {
                var lineNo = 0, ch;
                doc.iter(0, doc.size, function (line) {
                    var sz = line.text.length + 1;
                    if (sz > off) {
                        ch = off;
                        return true;
                    }
                    off -= sz;
                    ++lineNo;
                });
                return clipPos({line: lineNo, ch: ch});
            },
            indexFromPos: function (coords) {
                if (coords.line < 0 || coords.ch < 0) return 0;
                var index = coords.ch;
                doc.iter(0, coords.line, function (line) {
                    index += line.text.length + 1;
                });
                return index;
            },
            scrollTo: function (x, y) {
                if (x != null) scroller.scrollLeft = x;
                if (y != null) scroller.scrollTop = y;
                updateDisplay([]);
            },

            operation: function (f) {
                return operation(f)();
            },
            compoundChange: function (f) {
                return compoundChange(f);
            },
            refresh: function () {
                updateDisplay(true);
                if (scroller.scrollHeight > lastScrollPos)
                    scroller.scrollTop = lastScrollPos;
            },
            getInputField: function () {
                return input;
            },
            getWrapperElement: function () {
                return wrapper;
            },
            getScrollerElement: function () {
                return scroller;
            },
            getGutterElement: function () {
                return gutter;
            }
        };

        function getLine(n) {
            return getLineAt(doc, n);
        }

        function updateLineHeight(line, height) {
            gutterDirty = true;
            var diff = height - line.height;
            for (var n = line; n; n = n.parent) n.height += diff;
        }

        function setValue(code) {
            var top = {line: 0, ch: 0};
            updateLines(top, {line: doc.size - 1, ch: getLine(doc.size - 1).text.length},
                splitLines(code), top, top);
            updateInput = true;
        }

        function getValue() {
            var text = [];
            doc.iter(0, doc.size, function (line) {
                text.push(line.text);
            });
            return text.join("\n");
        }

        function onMouseDown(e) {
            setShift(e_prop(e, "shiftKey"));
            // Check whether this is a click in a widget
            for (var n = e_target(e); n != wrapper; n = n.parentNode)
                if (n.parentNode == code && n != mover) return;

            // See if this is a click in the gutter
            for (var n = e_target(e); n != wrapper; n = n.parentNode)
                if (n.parentNode == gutterText) {
                    if (options.onGutterClick)
                        options.onGutterClick(instance, indexOf(gutterText.childNodes, n) + showingFrom, e);
                    return e_preventDefault(e);
                }

            var start = posFromMouse(e);

            switch (e_button(e)) {
                case 3:
                    if (gecko && !mac) onContextMenu(e);
                    return;
                case 2:
                    if (start) setCursor(start.line, start.ch, true);
                    setTimeout(focusInput, 20);
                    return;
            }
            // For button 1, if it was clicked inside the editor
            // (posFromMouse returning non-null), we have to adjust the
            // selection.
            if (!start) {
                if (e_target(e) == scroller) e_preventDefault(e);
                return;
            }

            if (!focused) onFocus();

            var now = +new Date;
            if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {
                e_preventDefault(e);
                setTimeout(focusInput, 20);
                return selectLine(start.line);
            } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {
                lastDoubleClick = {time: now, pos: start};
                e_preventDefault(e);
                return selectWordAt(start);
            } else {
                lastClick = {time: now, pos: start};
            }

            var last = start, going;
            if (options.dragDrop && dragAndDrop && !options.readOnly && !posEq(sel.from, sel.to) && !posLess(start, sel.from) && !posLess(sel.to, start)) {
                // Let the drag handler handle this.
                if (webkit) lineSpace.draggable = true;
                function dragEnd(e2) {
                    if (webkit) lineSpace.draggable = false;
                    draggingText = false;
                    up();
                    drop();
                    if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {
                        e_preventDefault(e2);
                        setCursor(start.line, start.ch, true);
                        focusInput();
                    }
                }

                var up = connect(document, "mouseup", operation(dragEnd), true);
                var drop = connect(scroller, "drop", operation(dragEnd), true);
                draggingText = true;
                // IE's approach to draggable
                if (lineSpace.dragDrop) lineSpace.dragDrop();
                return;
            }
            e_preventDefault(e);
            setCursor(start.line, start.ch, true);

            function extend(e) {
                var cur = posFromMouse(e, true);
                if (cur && !posEq(cur, last)) {
                    if (!focused) onFocus();
                    last = cur;
                    setSelectionUser(start, cur);
                    updateInput = false;
                    var visible = visibleLines();
                    if (cur.line >= visible.to || cur.line < visible.from)
                        going = setTimeout(operation(function () {
                            extend(e);
                        }), 150);
                }
            }

            function done(e) {
                clearTimeout(going);
                var cur = posFromMouse(e);
                if (cur) setSelectionUser(start, cur);
                e_preventDefault(e);
                focusInput();
                updateInput = true;
                move();
                up();
            }

            var move = connect(document, "mousemove", operation(function (e) {
                clearTimeout(going);
                e_preventDefault(e);
                if (!ie && !e_button(e)) done(e);
                else extend(e);
            }), true);
            var up = connect(document, "mouseup", operation(done), true);
        }

        function onDoubleClick(e) {
            for (var n = e_target(e); n != wrapper; n = n.parentNode)
                if (n.parentNode == gutterText) return e_preventDefault(e);
            var start = posFromMouse(e);
            if (!start) return;
            lastDoubleClick = {time: +new Date, pos: start};
            e_preventDefault(e);
            selectWordAt(start);
        }

        function onDrop(e) {
            if (options.onDragEvent && options.onDragEvent(instance, addStop(e))) return;
            e.preventDefault();
            var pos = posFromMouse(e, true), files = e.dataTransfer.files;
            if (!pos || options.readOnly) return;
            if (files && files.length && window.FileReader && window.File) {
                function loadFile(file, i) {
                    var reader = new FileReader;
                    reader.onload = function () {
                        text[i] = reader.result;
                        if (++read == n) {
                            pos = clipPos(pos);
                            operation(function () {
                                var end = replaceRange(text.join(""), pos, pos);
                                setSelectionUser(pos, end);
                            })();
                        }
                    };
                    reader.readAsText(file);
                }

                var n = files.length, text = Array(n), read = 0;
                for (var i = 0; i < n; ++i) loadFile(files[i], i);
            }
            else {
                try {
                    var text = e.dataTransfer.getData("Text");
                    if (text) {
                        compoundChange(function () {
                            var curFrom = sel.from, curTo = sel.to;
                            setSelectionUser(pos, pos);
                            if (draggingText) replaceRange("", curFrom, curTo);
                            replaceSelection(text);
                            focusInput();
                        });
                    }
                }
                catch (e) {
                }
            }
        }

        function onDragStart(e) {
            var txt = getSelection();
            e.dataTransfer.setData("Text", txt);

            // Use dummy image instead of default browsers image.
            if (gecko || chrome) {
                var img = document.createElement('img');
                img.scr = ''; //1x1 image
                e.dataTransfer.setDragImage(img, 0, 0);
            }
        }

        function doHandleBinding(bound, dropShift) {
            if (typeof bound == "string") {
                bound = commands[bound];
                if (!bound) return false;
            }
            var prevShift = shiftSelecting;
            try {
                if (options.readOnly) suppressEdits = true;
                if (dropShift) shiftSelecting = null;
                bound(instance);
            } catch (e) {
                if (e != Pass) throw e;
                return false;
            } finally {
                shiftSelecting = prevShift;
                suppressEdits = false;
            }
            return true;
        }

        function handleKeyBinding(e) {
            // Handle auto keymap transitions
            var startMap = getKeyMap(options.keyMap), next = startMap.auto;
            clearTimeout(maybeTransition);
            if (next && !isModifierKey(e)) maybeTransition = setTimeout(function () {
                if (getKeyMap(options.keyMap) == startMap) {
                    options.keyMap = (next.call ? next.call(null, instance) : next);
                }
            }, 50);

            var name = keyNames[e_prop(e, "keyCode")], handled = false;
            if (name == null || e.altGraphKey) return false;
            if (e_prop(e, "altKey")) name = "Alt-" + name;
            if (e_prop(e, "ctrlKey")) name = "Ctrl-" + name;
            if (e_prop(e, "metaKey")) name = "Cmd-" + name;

            var stopped = false;

            function stop() {
                stopped = true;
            }

            if (e_prop(e, "shiftKey")) {
                handled = lookupKey("Shift-" + name, options.extraKeys, options.keyMap,
                        function (b) {
                            return doHandleBinding(b, true);
                        }, stop)
                    || lookupKey(name, options.extraKeys, options.keyMap, function (b) {
                        if (typeof b == "string" && /^go[A-Z]/.test(b)) return doHandleBinding(b);
                    }, stop);
            } else {
                handled = lookupKey(name, options.extraKeys, options.keyMap, doHandleBinding, stop);
            }
            if (stopped) handled = false;
            if (handled) {
                e_preventDefault(e);
                restartBlink();
                if (ie) {
                    e.oldKeyCode = e.keyCode;
                    e.keyCode = 0;
                }
            }
            return handled;
        }

        function handleCharBinding(e, ch) {
            var handled = lookupKey("'" + ch + "'", options.extraKeys,
                options.keyMap, function (b) {
                    return doHandleBinding(b, true);
                });
            if (handled) {
                e_preventDefault(e);
                restartBlink();
            }
            return handled;
        }

        var lastStoppedKey = null, maybeTransition;

        function onKeyDown(e) {
            if (!focused) onFocus();
            if (ie && e.keyCode == 27) {
                e.returnValue = false;
            }
            if (pollingFast) {
                if (readInput()) pollingFast = false;
            }
            if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
            var code = e_prop(e, "keyCode");
            // IE does strange things with escape.
            setShift(code == 16 || e_prop(e, "shiftKey"));
            // First give onKeyEvent option a chance to handle this.
            var handled = handleKeyBinding(e);
            if (window.opera) {
                lastStoppedKey = handled ? code : null;
                // Opera has no cut event... we try to at least catch the key combo
                if (!handled && code == 88 && e_prop(e, mac ? "metaKey" : "ctrlKey"))
                    replaceSelection("");
            }
        }

        function onKeyPress(e) {
            if (pollingFast) readInput();
            if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
            var keyCode = e_prop(e, "keyCode"), charCode = e_prop(e, "charCode");
            if (window.opera && keyCode == lastStoppedKey) {
                lastStoppedKey = null;
                e_preventDefault(e);
                return;
            }
            if (((window.opera && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(e)) return;
            var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
            if (options.electricChars && mode.electricChars && options.smartIndent && !options.readOnly) {
                if (mode.electricChars.indexOf(ch) > -1)
                    setTimeout(operation(function () {
                        indentLine(sel.to.line, "smart");
                    }), 75);
            }
            if (handleCharBinding(e, ch)) return;
            fastPoll();
        }

        function onKeyUp(e) {
            if (options.onKeyEvent && options.onKeyEvent(instance, addStop(e))) return;
            if (e_prop(e, "keyCode") == 16) shiftSelecting = null;
        }

        function onFocus() {
            if (options.readOnly == "nocursor") return;
            if (!focused) {
                if (options.onFocus) options.onFocus(instance);
                focused = true;
                if (wrapper.className.search(/\bCodeMirror-focused\b/) == -1)
                    wrapper.className += " CodeMirror-focused";
                if (!leaveInputAlone) resetInput(true);
            }
            slowPoll();
            restartBlink();
        }

        function onBlur() {
            if (focused) {
                if (options.onBlur) options.onBlur(instance);
                focused = false;
                if (bracketHighlighted)
                    operation(function () {
                        if (bracketHighlighted) {
                            bracketHighlighted();
                            bracketHighlighted = null;
                        }
                    })();
                wrapper.className = wrapper.className.replace(" CodeMirror-focused", "");
            }
            clearInterval(blinker);
            setTimeout(function () {
                if (!focused) shiftSelecting = null;
            }, 150);
        }

        // Replace the range from from to to by the strings in newText.
        // Afterwards, set the selection to selFrom, selTo.
        function updateLines(from, to, newText, selFrom, selTo) {
            if (suppressEdits) return;
            if (history) {
                var old = [];
                doc.iter(from.line, to.line + 1, function (line) {
                    old.push(line.text);
                });
                history.addChange(from.line, newText.length, old);
                while (history.done.length > options.undoDepth) history.done.shift();
            }
            updateLinesNoUndo(from, to, newText, selFrom, selTo);
        }

        function unredoHelper(from, to) {
            if (!from.length) return;
            var set = from.pop(), out = [];
            for (var i = set.length - 1; i >= 0; i -= 1) {
                var change = set[i];
                var replaced = [], end = change.start + change.added;
                doc.iter(change.start, end, function (line) {
                    replaced.push(line.text);
                });
                out.push({start: change.start, added: change.old.length, old: replaced});
                var pos = clipPos({
                    line: change.start + change.old.length - 1,
                    ch: editEnd(replaced[replaced.length - 1], change.old[change.old.length - 1])
                });
                updateLinesNoUndo({line: change.start, ch: 0}, {
                    line: end - 1,
                    ch: getLine(end - 1).text.length
                }, change.old, pos, pos);
            }
            updateInput = true;
            to.push(out);
        }

        function undo() {
            unredoHelper(history.done, history.undone);
        }

        function redo() {
            unredoHelper(history.undone, history.done);
        }

        function updateLinesNoUndo(from, to, newText, selFrom, selTo) {
            if (suppressEdits) return;
            var recomputeMaxLength = false, maxLineLength = maxLine.length;
            if (!options.lineWrapping)
                doc.iter(from.line, to.line + 1, function (line) {
                    if (!line.hidden && line.text.length == maxLineLength) {
                        recomputeMaxLength = true;
                        return true;
                    }
                });
            if (from.line != to.line || newText.length > 1) gutterDirty = true;

            var nlines = to.line - from.line, firstLine = getLine(from.line), lastLine = getLine(to.line);
            // First adjust the line structure, taking some care to leave highlighting intact.
            if (from.ch == 0 && to.ch == 0 && newText[newText.length - 1] == "") {
                // This is a whole-line replace. Treated specially to make
                // sure line objects move the way they are supposed to.
                var added = [], prevLine = null;
                if (from.line) {
                    prevLine = getLine(from.line - 1);
                    prevLine.fixMarkEnds(lastLine);
                } else lastLine.fixMarkStarts();
                for (var i = 0, e = newText.length - 1; i < e; ++i)
                    added.push(Line.inheritMarks(newText[i], prevLine));
                if (nlines) doc.remove(from.line, nlines, callbacks);
                if (added.length) doc.insert(from.line, added);
            } else if (firstLine == lastLine) {
                if (newText.length == 1)
                    firstLine.replace(from.ch, to.ch, newText[0]);
                else {
                    lastLine = firstLine.split(to.ch, newText[newText.length - 1]);
                    firstLine.replace(from.ch, null, newText[0]);
                    firstLine.fixMarkEnds(lastLine);
                    var added = [];
                    for (var i = 1, e = newText.length - 1; i < e; ++i)
                        added.push(Line.inheritMarks(newText[i], firstLine));
                    added.push(lastLine);
                    doc.insert(from.line + 1, added);
                }
            } else if (newText.length == 1) {
                firstLine.replace(from.ch, null, newText[0]);
                lastLine.replace(null, to.ch, "");
                firstLine.append(lastLine);
                doc.remove(from.line + 1, nlines, callbacks);
            } else {
                var added = [];
                firstLine.replace(from.ch, null, newText[0]);
                lastLine.replace(null, to.ch, newText[newText.length - 1]);
                firstLine.fixMarkEnds(lastLine);
                for (var i = 1, e = newText.length - 1; i < e; ++i)
                    added.push(Line.inheritMarks(newText[i], firstLine));
                if (nlines > 1) doc.remove(from.line + 1, nlines - 1, callbacks);
                doc.insert(from.line + 1, added);
            }
            if (options.lineWrapping) {
                var perLine = Math.max(5, scroller.clientWidth / charWidth() - 3);
                doc.iter(from.line, from.line + newText.length, function (line) {
                    if (line.hidden) return;
                    var guess = Math.ceil(line.text.length / perLine) || 1;
                    if (guess != line.height) updateLineHeight(line, guess);
                });
            } else {
                doc.iter(from.line, from.line + newText.length, function (line) {
                    var l = line.text;
                    if (!line.hidden && l.length > maxLineLength) {
                        maxLine = l;
                        maxLineLength = l.length;
                        maxWidth = null;
                        recomputeMaxLength = false;
                    }
                });
                if (recomputeMaxLength) maxLengthChanged = true;
            }

            // Add these lines to the work array, so that they will be
            // highlighted. Adjust work lines if lines were added/removed.
            var newWork = [], lendiff = newText.length - nlines - 1;
            for (var i = 0, l = work.length; i < l; ++i) {
                var task = work[i];
                if (task < from.line) newWork.push(task);
                else if (task > to.line) newWork.push(task + lendiff);
            }
            var hlEnd = from.line + Math.min(newText.length, 500);
            highlightLines(from.line, hlEnd);
            newWork.push(hlEnd);
            work = newWork;
            startWorker(100);
            // Remember that these lines changed, for updating the display
            changes.push({from: from.line, to: to.line + 1, diff: lendiff});
            var changeObj = {from: from, to: to, text: newText};
            if (textChanged) {
                for (var cur = textChanged; cur.next; cur = cur.next) {
                }
                cur.next = changeObj;
            } else textChanged = changeObj;

            // Update the selection
            function updateLine(n) {
                return n <= Math.min(to.line, to.line + lendiff) ? n : n + lendiff;
            }

            setSelection(selFrom, selTo, updateLine(sel.from.line), updateLine(sel.to.line));

            // Make sure the scroll-size div has the correct height.
            if (scroller.clientHeight)
                code.style.height = (doc.height * textHeight() + 2 * paddingTop()) + "px";
        }

        function computeMaxLength() {
            var maxLineLength = 0;
            maxLine = "";
            maxWidth = null;
            doc.iter(0, doc.size, function (line) {
                var l = line.text;
                if (!line.hidden && l.length > maxLineLength) {
                    maxLineLength = l.length;
                    maxLine = l;
                }
            });
            maxLengthChanged = false;
        }

        function replaceRange(code, from, to) {
            from = clipPos(from);
            if (!to) to = from; else to = clipPos(to);
            code = splitLines(code);
            function adjustPos(pos) {
                if (posLess(pos, from)) return pos;
                if (!posLess(to, pos)) return end;
                var line = pos.line + code.length - (to.line - from.line) - 1;
                var ch = pos.ch;
                if (pos.line == to.line)
                    ch += code[code.length - 1].length - (to.ch - (to.line == from.line ? from.ch : 0));
                return {line: line, ch: ch};
            }

            var end;
            replaceRange1(code, from, to, function (end1) {
                end = end1;
                return {from: adjustPos(sel.from), to: adjustPos(sel.to)};
            });
            return end;
        }

        function replaceSelection(code, collapse) {
            replaceRange1(splitLines(code), sel.from, sel.to, function (end) {
                if (collapse == "end") return {from: end, to: end};
                else if (collapse == "start") return {from: sel.from, to: sel.from};
                else return {from: sel.from, to: end};
            });
        }

        function replaceRange1(code, from, to, computeSel) {
            var endch = code.length == 1 ? code[0].length + from.ch : code[code.length - 1].length;
            var newSel = computeSel({line: from.line + code.length - 1, ch: endch});
            updateLines(from, to, code, newSel.from, newSel.to);
        }

        function getRange(from, to) {
            var l1 = from.line, l2 = to.line;
            if (l1 == l2) return getLine(l1).text.slice(from.ch, to.ch);
            var code = [getLine(l1).text.slice(from.ch)];
            doc.iter(l1 + 1, l2, function (line) {
                code.push(line.text);
            });
            code.push(getLine(l2).text.slice(0, to.ch));
            return code.join("\n");
        }

        function getSelection() {
            return getRange(sel.from, sel.to);
        }

        var pollingFast = false; // Ensures slowPoll doesn't cancel fastPoll
        function slowPoll() {
            if (pollingFast) return;
            poll.set(options.pollInterval, function () {
                startOperation();
                readInput();
                if (focused) slowPoll();
                endOperation();
            });
        }

        function fastPoll() {
            var missed = false;
            pollingFast = true;
            function p() {
                startOperation();
                var changed = readInput();
                if (!changed && !missed) {
                    missed = true;
                    poll.set(60, p);
                }
                else {
                    pollingFast = false;
                    slowPoll();
                }
                endOperation();
            }

            poll.set(20, p);
        }

        // Previnput is a hack to work with IME. If we reset the textarea
        // on every change, that breaks IME. So we look for changes
        // compared to the previous content instead. (Modern browsers have
        // events that indicate IME taking place, but these are not widely
        // supported or compatible enough yet to rely on.)
        var prevInput = "";

        function readInput() {
            if (leaveInputAlone || !focused || hasSelection(input) || options.readOnly) return false;
            var text = input.value;
            if (text == prevInput) return false;
            shiftSelecting = null;
            var same = 0, l = Math.min(prevInput.length, text.length);
            while (same < l && prevInput[same] == text[same]) ++same;
            if (same < prevInput.length)
                sel.from = {line: sel.from.line, ch: sel.from.ch - (prevInput.length - same)};
            else if (overwrite && posEq(sel.from, sel.to))
                sel.to = {
                    line: sel.to.line,
                    ch: Math.min(getLine(sel.to.line).text.length, sel.to.ch + (text.length - same))
                };
            replaceSelection(text.slice(same), "end");
            if (text.length > 1000) {
                input.value = prevInput = "";
            }
            else prevInput = text;
            return true;
        }

        function resetInput(user) {
            if (!posEq(sel.from, sel.to)) {
                prevInput = "";
                input.value = getSelection();
                selectInput(input);
            } else if (user) prevInput = input.value = "";
        }

        function focusInput() {
            if (options.readOnly != "nocursor") input.focus();
        }

        function scrollEditorIntoView() {
            if (!cursor.getBoundingClientRect) return;
            var rect = cursor.getBoundingClientRect();
            // IE returns bogus coordinates when the instance sits inside of an iframe and the cursor is hidden
            if (ie && rect.top == rect.bottom) return;
            var winH = window.innerHeight || Math.max(document.body.col - md - offset - Height, document.documentElement.col - md - offset - Height);
            if (rect.top < 0 || rect.bottom > winH) cursor.scrollIntoView();
        }

        function scrollCursorIntoView() {
            var cursor = localCoords(sel.inverted ? sel.from : sel.to);
            var x = options.lineWrapping ? Math.min(cursor.x, lineSpace.col - md - offset - Width) : cursor.x;
            return scrollIntoView(x, cursor.y, x, cursor.yBot);
        }

        function scrollIntoView(x1, y1, x2, y2) {
            var pl = paddingLeft(), pt = paddingTop();
            y1 += pt;
            y2 += pt;
            x1 += pl;
            x2 += pl;
            var screen = scroller.clientHeight, screentop = scroller.scrollTop, scrolled = false, result = true;
            if (y1 < screentop) {
                scroller.scrollTop = Math.max(0, y1);
                scrolled = true;
            }
            else if (y2 > screentop + screen) {
                scroller.scrollTop = y2 - screen;
                scrolled = true;
            }

            var screenw = scroller.clientWidth, screenleft = scroller.scrollLeft;
            var gutterw = options.fixedGutter ? gutter.clientWidth : 0;
            var atLeft = x1 < gutterw + pl + 10;
            if (x1 < screenleft + gutterw || atLeft) {
                if (atLeft) x1 = 0;
                scroller.scrollLeft = Math.max(0, x1 - 10 - gutterw);
                scrolled = true;
            }
            else if (x2 > screenw + screenleft - 3) {
                scroller.scrollLeft = x2 + 10 - screenw;
                scrolled = true;
                if (x2 > code.clientWidth) result = false;
            }
            if (scrolled && options.onScroll) options.onScroll(instance);
            return result;
        }

        function visibleLines() {
            var lh = textHeight(), top = scroller.scrollTop - paddingTop();
            var fromHeight = Math.max(0, Math.floor(top / lh));
            var toHeight = Math.ceil((top + scroller.clientHeight) / lh);
            return {
                from: lineAtHeight(doc, fromHeight),
                to: lineAtHeight(doc, toHeight)
            };
        }

        // Uses a set of changes plus the current scroll position to
        // determine which DOM updates have to be made, and makes the
        // updates.
        function updateDisplay(changes, suppressCallback) {
            if (!scroller.clientWidth) {
                showingFrom = showingTo = displayOffset = 0;
                return;
            }
            // Compute the new visible window
            var visible = visibleLines();
            // Bail out if the visible area is already rendered and nothing changed.
            if (changes !== true && changes.length == 0 && visible.from > showingFrom && visible.to < showingTo) return;
            var from = Math.max(visible.from - 100, 0), to = Math.min(doc.size, visible.to + 100);
            if (showingFrom < from && from - showingFrom < 20) from = showingFrom;
            if (showingTo > to && showingTo - to < 20) to = Math.min(doc.size, showingTo);

            // Create a range of theoretically intact lines, and punch holes
            // in that using the change info.
            var intact = changes === true ? [] :
                computeIntact([{from: showingFrom, to: showingTo, domStart: 0}], changes);
            // Clip off the parts that won't be visible
            var intactLines = 0;
            for (var i = 0; i < intact.length; ++i) {
                var range = intact[i];
                if (range.from < from) {
                    range.domStart += (from - range.from);
                    range.from = from;
                }
                if (range.to > to) range.to = to;
                if (range.from >= range.to) intact.splice(i--, 1);
                else intactLines += range.to - range.from;
            }
            if (intactLines == to - from && from == showingFrom && to == showingTo) return;
            intact.sort(function (a, b) {
                return a.domStart - b.domStart;
            });

            var th = textHeight(), gutterDisplay = gutter.style.display;
            lineDiv.style.display = "none";
            patchDisplay(from, to, intact);
            lineDiv.style.display = gutter.style.display = "";

            // Position the mover div to align with the lines it's supposed
            // to be showing (which will cover the visible display)
            var different = from != showingFrom || to != showingTo || lastSizeC != scroller.clientHeight + th;
            // This is just a bogus formula that detects when the editor is
            // resized or the font size changes.
            if (different) lastSizeC = scroller.clientHeight + th;
            showingFrom = from;
            showingTo = to;
            displayOffset = heightAtLine(doc, from);
            mover.style.top = (displayOffset * th) + "px";
            if (scroller.clientHeight)
                code.style.height = (doc.height * th + 2 * paddingTop()) + "px";

            // Since this is all rather error prone, it is honoured with the
            // only assertion in the whole file.
            if (lineDiv.childNodes.length != showingTo - showingFrom)
                throw new Error("BAD PATCH! " + JSON.stringify(intact) + " size=" + (showingTo - showingFrom) +
                    " nodes=" + lineDiv.childNodes.length);

            function checkHeights() {
                maxWidth = scroller.clientWidth;
                var curNode = lineDiv.firstChild, heightChanged = false;
                doc.iter(showingFrom, showingTo, function (line) {
                    if (!line.hidden) {
                        var height = Math.round(curNode.col - md - offset - Height / th) || 1;
                        if (line.height != height) {
                            updateLineHeight(line, height);
                            gutterDirty = heightChanged = true;
                        }
                    }
                    curNode = curNode.nextSibling;
                });
                if (heightChanged)
                    code.style.height = (doc.height * th + 2 * paddingTop()) + "px";
                return heightChanged;
            }

            if (options.lineWrapping) {
                checkHeights();
            } else {
                if (maxWidth == null) maxWidth = stringWidth(maxLine);
                if (maxWidth > scroller.clientWidth) {
                    lineSpace.style.width = maxWidth + "px";
                    // Needed to prevent odd wrapping/hiding of widgets placed in here.
                    code.style.width = "";
                    code.style.width = scroller.scrollWidth + "px";
                } else {
                    lineSpace.style.width = code.style.width = "";
                }
            }

            gutter.style.display = gutterDisplay;
            if (different || gutterDirty) {
                // If the gutter grew in size, re-check heights. If those changed, re-draw gutter.
                updateGutter() && options.lineWrapping && checkHeights() && updateGutter();
            }
            updateSelection();
            if (!suppressCallback && options.onUpdate) options.onUpdate(instance);
            return true;
        }

        function computeIntact(intact, changes) {
            for (var i = 0, l = changes.length || 0; i < l; ++i) {
                var change = changes[i], intact2 = [], diff = change.diff || 0;
                for (var j = 0, l2 = intact.length; j < l2; ++j) {
                    var range = intact[j];
                    if (change.to <= range.from && change.diff)
                        intact2.push({
                            from: range.from + diff, to: range.to + diff,
                            domStart: range.domStart
                        });
                    else if (change.to <= range.from || change.from >= range.to)
                        intact2.push(range);
                    else {
                        if (change.from > range.from)
                            intact2.push({from: range.from, to: change.from, domStart: range.domStart});
                        if (change.to < range.to)
                            intact2.push({
                                from: change.to + diff, to: range.to + diff,
                                domStart: range.domStart + (change.to - range.from)
                            });
                    }
                }
                intact = intact2;
            }
            return intact;
        }

        function patchDisplay(from, to, intact) {
            // The first pass removes the DOM nodes that aren't intact.
            if (!intact.length) lineDiv.innerHTML = "";
            else {
                function killNode(node) {
                    var tmp = node.nextSibling;
                    node.parentNode.removeChild(node);
                    return tmp;
                }

                var domPos = 0, curNode = lineDiv.firstChild, n;
                for (var i = 0; i < intact.length; ++i) {
                    var cur = intact[i];
                    while (cur.domStart > domPos) {
                        curNode = killNode(curNode);
                        domPos++;
                    }
                    for (var j = 0, e = cur.to - cur.from; j < e; ++j) {
                        curNode = curNode.nextSibling;
                        domPos++;
                    }
                }
                while (curNode) curNode = killNode(curNode);
            }
            // This pass fills in the lines that actually changed.
            var nextIntact = intact.shift(), curNode = lineDiv.firstChild, j = from;
            var scratch = document.createElement("div");
            doc.iter(from, to, function (line) {
                if (nextIntact && nextIntact.to == j) nextIntact = intact.shift();
                if (!nextIntact || nextIntact.from > j) {
                    if (line.hidden) var html = scratch.innerHTML = "<pre></pre>";
                    else {
                        var html = '<pre' + (line.className ? ' class="' + line.className + '"' : '') + '>'
                            + line.getHTML(makeTab) + '</pre>';
                        // Kludge to make sure the styled element lies behind the selection (by z-index)
                        if (line.bgClassName)
                            html = '<div style="position: relative"><pre class="' + line.bgClassName +
                                '" style="position: absolute; left: 0; right: 0; top: 0; bottom: 0; z-index: -2">&#160;</pre>' + html + "</div>";
                    }
                    scratch.innerHTML = html;
                    lineDiv.insertBefore(scratch.firstChild, curNode);
                } else {
                    curNode = curNode.nextSibling;
                }
                ++j;
            });
        }

        function updateGutter() {
            if (!options.gutter && !options.lineNumbers) return;
            var hText = mover.col - md - offset - Height, hEditor = scroller.clientHeight;
            gutter.style.height = (hText - hEditor < 2 ? hEditor : hText) + "px";
            var html = [], i = showingFrom, normalNode;
            doc.iter(showingFrom, Math.max(showingTo, showingFrom + 1), function (line) {
                if (line.hidden) {
                    html.push("<pre></pre>");
                } else {
                    var marker = line.gutterMarker;
                    var text = options.lineNumbers ? i + options.firstLineNumber : null;
                    if (marker && marker.text)
                        text = marker.text.replace("%N%", text != null ? text : "");
                    else if (text == null)
                        text = "\u00a0";
                    html.push((marker && marker.style ? '<pre class="' + marker.style + '">' : "<pre>"), text);
                    for (var j = 1; j < line.height; ++j) html.push("<br/>&#160;");
                    html.push("</pre>");
                    if (!marker) normalNode = i;
                }
                ++i;
            });
            gutter.style.display = "none";
            gutterText.innerHTML = html.join("");
            // Make sure scrolling doesn't cause number gutter size to pop
            if (normalNode != null) {
                var node = gutterText.childNodes[normalNode - showingFrom];
                var minwidth = String(doc.size).length, val = eltText(node), pad = "";
                while (val.length + pad.length < minwidth) pad += "\u00a0";
                if (pad) node.insertBefore(document.createTextNode(pad), node.firstChild);
            }
            gutter.style.display = "";
            var resized = Math.abs((parseInt(lineSpace.style.marginLeft) || 0) - gutter.col - md - offset - Width) > 2;
            lineSpace.style.marginLeft = gutter.col - md - offset - Width + "px";
            gutterDirty = false;
            return resized;
        }

        function updateSelection() {
            var collapsed = posEq(sel.from, sel.to);
            var fromPos = localCoords(sel.from, true);
            var toPos = collapsed ? fromPos : localCoords(sel.to, true);
            var headPos = sel.inverted ? fromPos : toPos, th = textHeight();
            var wrapOff = eltOffset(wrapper), lineOff = eltOffset(lineDiv);
            inputDiv.style.top = Math.max(0, Math.min(scroller.col - md - offset - Height, headPos.y + lineOff.top - wrapOff.top)) + "px";
            inputDiv.style.left = Math.max(0, Math.min(scroller.col - md - offset - Width, headPos.x + lineOff.left - wrapOff.left)) + "px";
            if (collapsed) {
                cursor.style.top = headPos.y + "px";
                cursor.style.left = (options.lineWrapping ? Math.min(headPos.x, lineSpace.col - md - offset - Width) : headPos.x) + "px";
                cursor.style.display = "";
                selectionDiv.style.display = "none";
            } else {
                var sameLine = fromPos.y == toPos.y, html = "";
                var clientWidth = lineSpace.clientWidth || lineSpace.col - md - offset - Width;
                var clientHeight = lineSpace.clientHeight || lineSpace.col - md - offset - Height;

                function add(left, top, right, height) {
                    var rstyle = quirksMode ? "width: " + (!right ? clientWidth : clientWidth - right - left) + "px"
                        : "right: " + right + "px";
                    html += '<div class="CodeMirror-selected" style="position: absolute; left: ' + left +
                        'px; top: ' + top + 'px; ' + rstyle + '; height: ' + height + 'px"></div>';
                }

                if (sel.from.ch && fromPos.y >= 0) {
                    var right = sameLine ? clientWidth - toPos.x : 0;
                    add(fromPos.x, fromPos.y, right, th);
                }
                var middleStart = Math.max(0, fromPos.y + (sel.from.ch ? th : 0));
                var middleHeight = Math.min(toPos.y, clientHeight) - middleStart;
                if (middleHeight > 0.2 * th)
                    add(0, middleStart, 0, middleHeight);
                if ((!sameLine || !sel.from.ch) && toPos.y < clientHeight - .5 * th)
                    add(0, toPos.y, clientWidth - toPos.x, th);
                selectionDiv.innerHTML = html;
                cursor.style.display = "none";
                selectionDiv.style.display = "";
            }
        }

        function setShift(val) {
            if (val) shiftSelecting = shiftSelecting || (sel.inverted ? sel.to : sel.from);
            else shiftSelecting = null;
        }

        function setSelectionUser(from, to) {
            var sh = shiftSelecting && clipPos(shiftSelecting);
            if (sh) {
                if (posLess(sh, from)) from = sh;
                else if (posLess(to, sh)) to = sh;
            }
            setSelection(from, to);
            userSelChange = true;
        }

        // Update the selection. Last two args are only used by
        // updateLines, since they have to be expressed in the line
        // numbers before the update.
        function setSelection(from, to, oldFrom, oldTo) {
            goalColumn = null;
            if (oldFrom == null) {
                oldFrom = sel.from.line;
                oldTo = sel.to.line;
            }
            if (posEq(sel.from, from) && posEq(sel.to, to)) return;
            if (posLess(to, from)) {
                var tmp = to;
                to = from;
                from = tmp;
            }

            // Skip over hidden lines.
            if (from.line != oldFrom) {
                var from1 = skipHidden(from, oldFrom, sel.from.ch);
                // If there is no non-hidden line left, force visibility on current line
                if (!from1) setLineHidden(from.line, false);
                else from = from1;
            }
            if (to.line != oldTo) to = skipHidden(to, oldTo, sel.to.ch);

            if (posEq(from, to)) sel.inverted = false;
            else if (posEq(from, sel.to)) sel.inverted = false;
            else if (posEq(to, sel.from)) sel.inverted = true;

            if (options.autoClearEmptyLines && posEq(sel.from, sel.to)) {
                var head = sel.inverted ? from : to;
                if (head.line != sel.from.line && sel.from.line < doc.size) {
                    var oldLine = getLine(sel.from.line);
                    if (/^\s+$/.test(oldLine.text))
                        setTimeout(operation(function () {
                            if (oldLine.parent && /^\s+$/.test(oldLine.text)) {
                                var no = lineNo(oldLine);
                                replaceRange("", {line: no, ch: 0}, {line: no, ch: oldLine.text.length});
                            }
                        }, 10));
                }
            }

            sel.from = from;
            sel.to = to;
            selectionChanged = true;
        }

        function skipHidden(pos, oldLine, oldCh) {
            function getNonHidden(dir) {
                var lNo = pos.line + dir, end = dir == 1 ? doc.size : -1;
                while (lNo != end) {
                    var line = getLine(lNo);
                    if (!line.hidden) {
                        var ch = pos.ch;
                        if (toEnd || ch > oldCh || ch > line.text.length) ch = line.text.length;
                        return {line: lNo, ch: ch};
                    }
                    lNo += dir;
                }
            }

            var line = getLine(pos.line);
            var toEnd = pos.ch == line.text.length && pos.ch != oldCh;
            if (!line.hidden) return pos;
            if (pos.line >= oldLine) return getNonHidden(1) || getNonHidden(-1);
            else return getNonHidden(-1) || getNonHidden(1);
        }

        function setCursor(line, ch, user) {
            var pos = clipPos({line: line, ch: ch || 0});
            (user ? setSelectionUser : setSelection)(pos, pos);
        }

        function clipLine(n) {
            return Math.max(0, Math.min(n, doc.size - 1));
        }

        function clipPos(pos) {
            if (pos.line < 0) return {line: 0, ch: 0};
            if (pos.line >= doc.size) return {line: doc.size - 1, ch: getLine(doc.size - 1).text.length};
            var ch = pos.ch, linelen = getLine(pos.line).text.length;
            if (ch == null || ch > linelen) return {line: pos.line, ch: linelen};
            else if (ch < 0) return {line: pos.line, ch: 0};
            else return pos;
        }

        function findPosH(dir, unit) {
            var end = sel.inverted ? sel.from : sel.to, line = end.line, ch = end.ch;
            var lineObj = getLine(line);

            function findNextLine() {
                for (var l = line + dir, e = dir < 0 ? -1 : doc.size; l != e; l += dir) {
                    var lo = getLine(l);
                    if (!lo.hidden) {
                        line = l;
                        lineObj = lo;
                        return true;
                    }
                }
            }

            function moveOnce(boundToLine) {
                if (ch == (dir < 0 ? 0 : lineObj.text.length)) {
                    if (!boundToLine && findNextLine()) ch = dir < 0 ? lineObj.text.length : 0;
                    else return false;
                } else ch += dir;
                return true;
            }

            if (unit == "char") moveOnce();
            else if (unit == "column") moveOnce(true);
            else if (unit == "word") {
                var sawWord = false;
                for (; ;) {
                    if (dir < 0) if (!moveOnce()) break;
                    if (isWordChar(lineObj.text.charAt(ch))) sawWord = true;
                    else if (sawWord) {
                        if (dir < 0) {
                            dir = 1;
                            moveOnce();
                        }
                        break;
                    }
                    if (dir > 0) if (!moveOnce()) break;
                }
            }
            return {line: line, ch: ch};
        }

        function moveH(dir, unit) {
            var pos = dir < 0 ? sel.from : sel.to;
            if (shiftSelecting || posEq(sel.from, sel.to)) pos = findPosH(dir, unit);
            setCursor(pos.line, pos.ch, true);
        }

        function deleteH(dir, unit) {
            if (!posEq(sel.from, sel.to)) replaceRange("", sel.from, sel.to);
            else if (dir < 0) replaceRange("", findPosH(dir, unit), sel.to);
            else replaceRange("", sel.from, findPosH(dir, unit));
            userSelChange = true;
        }

        var goalColumn = null;

        function moveV(dir, unit) {
            var dist = 0, pos = localCoords(sel.inverted ? sel.from : sel.to, true);
            if (goalColumn != null) pos.x = goalColumn;
            if (unit == "page") dist = Math.min(scroller.clientHeight, window.innerHeight || document.documentElement.clientHeight);
            else if (unit == "line") dist = textHeight();
            var target = coordsChar(pos.x, pos.y + dist * dir + 2);
            if (unit == "page") scroller.scrollTop += localCoords(target, true).y - pos.y;
            setCursor(target.line, target.ch, true);
            goalColumn = pos.x;
        }

        function selectWordAt(pos) {
            var line = getLine(pos.line).text;
            var start = pos.ch, end = pos.ch;
            while (start > 0 && isWordChar(line.charAt(start - 1))) --start;
            while (end < line.length && isWordChar(line.charAt(end))) ++end;
            setSelectionUser({line: pos.line, ch: start}, {line: pos.line, ch: end});
        }

        function selectLine(line) {
            setSelectionUser({line: line, ch: 0}, clipPos({line: line + 1, ch: 0}));
        }

        function indentSelected(mode) {
            if (posEq(sel.from, sel.to)) return indentLine(sel.from.line, mode);
            var e = sel.to.line - (sel.to.ch ? 0 : 1);
            for (var i = sel.from.line; i <= e; ++i) indentLine(i, mode);
        }

        function indentLine(n, how) {
            if (!how) how = "add";
            if (how == "smart") {
                if (!mode.indent) how = "prev";
                else var state = getStateBefore(n);
            }

            var line = getLine(n), curSpace = line.indentation(options.tabSize),
                curSpaceString = line.text.match(/^\s*/)[0], indentation;
            if (how == "prev") {
                if (n) indentation = getLine(n - 1).indentation(options.tabSize);
                else indentation = 0;
            }
            else if (how == "smart") indentation = mode.indent(state, line.text.slice(curSpaceString.length), line.text);
            else if (how == "add") indentation = curSpace + options.indentUnit;
            else if (how == "subtract") indentation = curSpace - options.indentUnit;
            indentation = Math.max(0, indentation);
            var diff = indentation - curSpace;

            if (!diff) {
                if (sel.from.line != n && sel.to.line != n) return;
                var indentString = curSpaceString;
            }
            else {
                var indentString = "", pos = 0;
                if (options.indentWithTabs)
                    for (var i = Math.floor(indentation / options.tabSize); i; --i) {
                        pos += options.tabSize;
                        indentString += "\t";
                    }
                while (pos < indentation) {
                    ++pos;
                    indentString += " ";
                }
            }

            replaceRange(indentString, {line: n, ch: 0}, {line: n, ch: curSpaceString.length});
        }

        function loadMode() {
            mode = CodeMirror.getMode(options, options.mode);
            doc.iter(0, doc.size, function (line) {
                line.stateAfter = null;
            });
            work = [0];
            startWorker();
        }

        function gutterChanged() {
            var visible = options.gutter || options.lineNumbers;
            gutter.style.display = visible ? "" : "none";
            if (visible) gutterDirty = true;
            else lineDiv.parentNode.style.marginLeft = 0;
        }

        function wrappingChanged(from, to) {
            if (options.lineWrapping) {
                wrapper.className += " CodeMirror-wrap";
                var perLine = scroller.clientWidth / charWidth() - 3;
                doc.iter(0, doc.size, function (line) {
                    if (line.hidden) return;
                    var guess = Math.ceil(line.text.length / perLine) || 1;
                    if (guess != 1) updateLineHeight(line, guess);
                });
                lineSpace.style.width = code.style.width = "";
            } else {
                wrapper.className = wrapper.className.replace(" CodeMirror-wrap", "");
                maxWidth = null;
                maxLine = "";
                doc.iter(0, doc.size, function (line) {
                    if (line.height != 1 && !line.hidden) updateLineHeight(line, 1);
                    if (line.text.length > maxLine.length) maxLine = line.text;
                });
            }
            changes.push({from: 0, to: doc.size});
        }

        function makeTab(col) {
            var w = options.tabSize - col % options.tabSize, cached = tabCache[w];
            if (cached) return cached;
            for (var str = '<span class="cm-tab">', i = 0; i < w; ++i) str += " ";
            return (tabCache[w] = {html: str + "</span>", width: w});
        }

        function themeChanged() {
            scroller.className = scroller.className.replace(/\s*cm-s-\S+/g, "") +
                options.theme.replace(/(^|\s)\s*/g, " cm-s-");
        }

        function keyMapChanged() {
            var style = keyMap[options.keyMap].style;
            wrapper.className = wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +
                (style ? " cm-keymap-" + style : "");
        }

        function TextMarker() {
            this.set = [];
        }

        TextMarker.prototype.clear = operation(function () {
            var min = Infinity, max = -Infinity;
            for (var i = 0, e = this.set.length; i < e; ++i) {
                var line = this.set[i], mk = line.marked;
                if (!mk || !line.parent) continue;
                var lineN = lineNo(line);
                min = Math.min(min, lineN);
                max = Math.max(max, lineN);
                for (var j = 0; j < mk.length; ++j)
                    if (mk[j].marker == this) mk.splice(j--, 1);
            }
            if (min != Infinity)
                changes.push({from: min, to: max + 1});
        });
        TextMarker.prototype.find = function () {
            var from, to;
            for (var i = 0, e = this.set.length; i < e; ++i) {
                var line = this.set[i], mk = line.marked;
                for (var j = 0; j < mk.length; ++j) {
                    var mark = mk[j];
                    if (mark.marker == this) {
                        if (mark.from != null || mark.to != null) {
                            var found = lineNo(line);
                            if (found != null) {
                                if (mark.from != null) from = {line: found, ch: mark.from};
                                if (mark.to != null) to = {line: found, ch: mark.to};
                            }
                        }
                    }
                }
            }
            return {from: from, to: to};
        };

        function markText(from, to, className) {
            from = clipPos(from);
            to = clipPos(to);
            var tm = new TextMarker();
            if (!posLess(from, to)) return tm;
            function add(line, from, to, className) {
                getLine(line).addMark(new MarkedText(from, to, className, tm));
            }

            if (from.line == to.line) add(from.line, from.ch, to.ch, className);
            else {
                add(from.line, from.ch, null, className);
                for (var i = from.line + 1, e = to.line; i < e; ++i)
                    add(i, null, null, className);
                add(to.line, null, to.ch, className);
            }
            changes.push({from: from.line, to: to.line + 1});
            return tm;
        }

        function setBookmark(pos) {
            pos = clipPos(pos);
            var bm = new Bookmark(pos.ch);
            getLine(pos.line).addMark(bm);
            return bm;
        }

        function findMarksAt(pos) {
            pos = clipPos(pos);
            var markers = [], marked = getLine(pos.line).marked;
            if (!marked) return markers;
            for (var i = 0, e = marked.length; i < e; ++i) {
                var m = marked[i];
                if ((m.from == null || m.from <= pos.ch) &&
                    (m.to == null || m.to >= pos.ch))
                    markers.push(m.marker || m);
            }
            return markers;
        }

        function addGutterMarker(line, text, className) {
            if (typeof line == "number") line = getLine(clipLine(line));
            line.gutterMarker = {text: text, style: className};
            gutterDirty = true;
            return line;
        }

        function removeGutterMarker(line) {
            if (typeof line == "number") line = getLine(clipLine(line));
            line.gutterMarker = null;
            gutterDirty = true;
        }

        function changeLine(handle, op) {
            var no = handle, line = handle;
            if (typeof handle == "number") line = getLine(clipLine(handle));
            else no = lineNo(handle);
            if (no == null) return null;
            if (op(line, no)) changes.push({from: no, to: no + 1});
            else return null;
            return line;
        }

        function setLineClass(handle, className, bgClassName) {
            return changeLine(handle, function (line) {
                if (line.className != className || line.bgClassName != bgClassName) {
                    line.className = className;
                    line.bgClassName = bgClassName;
                    return true;
                }
            });
        }

        function setLineHidden(handle, hidden) {
            return changeLine(handle, function (line, no) {
                if (line.hidden != hidden) {
                    line.hidden = hidden;
                    if (!options.lineWrapping) {
                        var l = line.text;
                        if (hidden && l.length == maxLine.length) {
                            maxLengthChanged = true;
                        }
                        else if (!hidden && l.length > maxLine.length) {
                            maxLine = l;
                            maxWidth = null;
                            maxLengthChanged = false;
                        }
                    }
                    updateLineHeight(line, hidden ? 0 : 1);
                    var fline = sel.from.line, tline = sel.to.line;
                    if (hidden && (fline == no || tline == no)) {
                        var from = fline == no ? skipHidden({line: fline, ch: 0}, fline, 0) : sel.from;
                        var to = tline == no ? skipHidden({line: tline, ch: 0}, tline, 0) : sel.to;
                        // Can't hide the last visible line, we'd have no place to put the cursor
                        if (!to) return;
                        setSelection(from, to);
                    }
                    return (gutterDirty = true);
                }
            });
        }

        function lineInfo(line) {
            if (typeof line == "number") {
                if (!isLine(line)) return null;
                var n = line;
                line = getLine(line);
                if (!line) return null;
            }
            else {
                var n = lineNo(line);
                if (n == null) return null;
            }
            var marker = line.gutterMarker;
            return {
                line: n, handle: line, text: line.text, markerText: marker && marker.text,
                markerClass: marker && marker.style, lineClass: line.className, bgClass: line.bgClassName
            };
        }

        function stringWidth(str) {
            measure.innerHTML = "<pre><span>x</span></pre>";
            measure.firstChild.firstChild.firstChild.nodeValue = str;
            return measure.firstChild.firstChild.col - md - offset - Width || 10;
        }

        // These are used to go from pixel positions to character
        // positions, taking varying character widths into account.
        function charFromX(line, x) {
            if (x <= 0) return 0;
            var lineObj = getLine(line), text = lineObj.text;

            function getX(len) {
                return measureLine(lineObj, len).left;
            }

            var from = 0, fromX = 0, to = text.length, toX;
            // Guess a suitable upper bound for our search.
            var estimated = Math.min(to, Math.ceil(x / charWidth()));
            for (; ;) {
                var estX = getX(estimated);
                if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
                else {
                    toX = estX;
                    to = estimated;
                    break;
                }
            }
            if (x > toX) return to;
            // Try to guess a suitable lower bound as well.
            estimated = Math.floor(to * 0.8);
            estX = getX(estimated);
            if (estX < x) {
                from = estimated;
                fromX = estX;
            }
            // Do a binary search between these bounds.
            for (; ;) {
                if (to - from <= 1) return (toX - x > x - fromX) ? from : to;
                var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
                if (middleX > x) {
                    to = middle;
                    toX = middleX;
                }
                else {
                    from = middle;
                    fromX = middleX;
                }
            }
        }

        var tempId = "CodeMirror-temp-" + Math.floor(Math.random() * 0xffffff).toString(16);

        function measureLine(line, ch) {
            if (ch == 0) return {top: 0, left: 0};
            var wbr = options.lineWrapping && ch < line.text.length &&
                spanAffectsWrapping.test(line.text.slice(ch - 1, ch + 1));
            measure.innerHTML = "<pre>" + line.getHTML(makeTab, ch, tempId, wbr) + "</pre>";
            var elt = document.getElementById(tempId);
            var top = elt.col - md - offset - Top, left = elt.col - md - offset - Left;
            // Older IEs report zero offsets for spans directly after a wrap
            if (ie && top == 0 && left == 0) {
                var backup = document.createElement("span");
                backup.innerHTML = "x";
                elt.parentNode.insertBefore(backup, elt.nextSibling);
                top = backup.col - md - offset - Top;
            }
            return {top: top, left: left};
        }

        function localCoords(pos, inLineWrap) {
            var x, lh = textHeight(), y = lh * (heightAtLine(doc, pos.line) - (inLineWrap ? displayOffset : 0));
            if (pos.ch == 0) x = 0;
            else {
                var sp = measureLine(getLine(pos.line), pos.ch);
                x = sp.left;
                if (options.lineWrapping) y += Math.max(0, sp.top);
            }
            return {x: x, y: y, yBot: y + lh};
        }

        // Coords must be lineSpace-local
        function coordsChar(x, y) {
            if (y < 0) y = 0;
            var th = textHeight(), cw = charWidth(), heightPos = displayOffset + Math.floor(y / th);
            var lineNo = lineAtHeight(doc, heightPos);
            if (lineNo >= doc.size) return {line: doc.size - 1, ch: getLine(doc.size - 1).text.length};
            var lineObj = getLine(lineNo), text = lineObj.text;
            var tw = options.lineWrapping, innerOff = tw ? heightPos - heightAtLine(doc, lineNo) : 0;
            if (x <= 0 && innerOff == 0) return {line: lineNo, ch: 0};
            function getX(len) {
                var sp = measureLine(lineObj, len);
                if (tw) {
                    var off = Math.round(sp.top / th);
                    return Math.max(0, sp.left + (off - innerOff) * scroller.clientWidth);
                }
                return sp.left;
            }

            var from = 0, fromX = 0, to = text.length, toX;
            // Guess a suitable upper bound for our search.
            var estimated = Math.min(to, Math.ceil((x + innerOff * scroller.clientWidth * .9) / cw));
            for (; ;) {
                var estX = getX(estimated);
                if (estX <= x && estimated < to) estimated = Math.min(to, Math.ceil(estimated * 1.2));
                else {
                    toX = estX;
                    to = estimated;
                    break;
                }
            }
            if (x > toX) return {line: lineNo, ch: to};
            // Try to guess a suitable lower bound as well.
            estimated = Math.floor(to * 0.8);
            estX = getX(estimated);
            if (estX < x) {
                from = estimated;
                fromX = estX;
            }
            // Do a binary search between these bounds.
            for (; ;) {
                if (to - from <= 1) return {line: lineNo, ch: (toX - x > x - fromX) ? from : to};
                var middle = Math.ceil((from + to) / 2), middleX = getX(middle);
                if (middleX > x) {
                    to = middle;
                    toX = middleX;
                }
                else {
                    from = middle;
                    fromX = middleX;
                }
            }
        }

        function pageCoords(pos) {
            var local = localCoords(pos, true), off = eltOffset(lineSpace);
            return {x: off.left + local.x, y: off.top + local.y, yBot: off.top + local.yBot};
        }

        var cachedHeight, cachedHeightFor, measureText;

        function textHeight() {
            if (measureText == null) {
                measureText = "<pre>";
                for (var i = 0; i < 49; ++i) measureText += "x<br/>";
                measureText += "x</pre>";
            }
            var offsetHeight = lineDiv.clientHeight;
            if (offsetHeight == cachedHeightFor) return cachedHeight;
            cachedHeightFor = offsetHeight;
            measure.innerHTML = measureText;
            cachedHeight = measure.firstChild.col - md - offset - Height / 50 || 1;
            measure.innerHTML = "";
            return cachedHeight;
        }

        var cachedWidth, cachedWidthFor = 0;

        function charWidth() {
            if (scroller.clientWidth == cachedWidthFor) return cachedWidth;
            cachedWidthFor = scroller.clientWidth;
            return (cachedWidth = stringWidth("x"));
        }

        function paddingTop() {
            return lineSpace.col - md - offset - Top;
        }

        function paddingLeft() {
            return lineSpace.col - md - offset - Left;
        }

        function posFromMouse(e, liberal) {
            var offW = eltOffset(scroller, true), x, y;
            // Fails unpredictably on IE[67] when mouse is dragged around quickly.
            try {
                x = e.clientX;
                y = e.clientY;
            } catch (e) {
                return null;
            }
            // This is a mess of a heuristic to try and determine whether a
            // scroll-bar was clicked or not, and to return null if one was
            // (and !liberal).
            if (!liberal && (x - offW.left > scroller.clientWidth || y - offW.top > scroller.clientHeight))
                return null;
            var offL = eltOffset(lineSpace, true);
            return coordsChar(x - offL.left, y - offL.top);
        }

        function onContextMenu(e) {
            var pos = posFromMouse(e), scrollPos = scroller.scrollTop;
            if (!pos || window.opera) return; // Opera is difficult.
            if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))
                operation(setCursor)(pos.line, pos.ch);

            var oldCSS = input.style.cssText;
            inputDiv.style.position = "absolute";
            input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +
                "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; " +
                "border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
            leaveInputAlone = true;
            var val = input.value = getSelection();
            focusInput();
            selectInput(input);
            function rehide() {
                var newVal = splitLines(input.value).join("\n");
                if (newVal != val) operation(replaceSelection)(newVal, "end");
                inputDiv.style.position = "relative";
                input.style.cssText = oldCSS;
                if (ie_lt9) scroller.scrollTop = scrollPos;
                leaveInputAlone = false;
                resetInput(true);
                slowPoll();
            }

            if (gecko) {
                e_stop(e);
                var mouseup = connect(window, "mouseup", function () {
                    mouseup();
                    setTimeout(rehide, 20);
                }, true);
            } else {
                setTimeout(rehide, 50);
            }
        }

        // Cursor-blinking
        function restartBlink() {
            clearInterval(blinker);
            var on = true;
            cursor.style.visibility = "";
            blinker = setInterval(function () {
                cursor.style.visibility = (on = !on) ? "" : "hidden";
            }, 650);
        }

        var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<"};

        function matchBrackets(autoclear) {
            var head = sel.inverted ? sel.from : sel.to, line = getLine(head.line), pos = head.ch - 1;
            var match = (pos >= 0 && matching[line.text.charAt(pos)]) || matching[line.text.charAt(++pos)];
            if (!match) return;
            var ch = match.charAt(0), forward = match.charAt(1) == ">", d = forward ? 1 : -1, st = line.styles;
            for (var off = pos + 1, i = 0, e = st.length; i < e; i += 2)
                if ((off -= st[i].length) <= 0) {
                    var style = st[i + 1];
                    break;
                }

            var stack = [line.text.charAt(pos)], re = /[(){}[\]]/;

            function scan(line, from, to) {
                if (!line.text) return;
                var st = line.styles, pos = forward ? 0 : line.text.length - 1, cur;
                for (var i = forward ? 0 : st.length - 2, e = forward ? st.length : -2; i != e; i += 2 * d) {
                    var text = st[i];
                    if (st[i + 1] != null && st[i + 1] != style) {
                        pos += d * text.length;
                        continue;
                    }
                    for (var j = forward ? 0 : text.length - 1, te = forward ? text.length : -1; j != te; j += d, pos += d) {
                        if (pos >= from && pos < to && re.test(cur = text.charAt(j))) {
                            var match = matching[cur];
                            if (match.charAt(1) == ">" == forward) stack.push(cur);
                            else if (stack.pop() != match.charAt(0)) return {pos: pos, match: false};
                            else if (!stack.length) return {pos: pos, match: true};
                        }
                    }
                }
            }

            for (var i = head.line, e = forward ? Math.min(i + 100, doc.size) : Math.max(-1, i - 100); i != e; i += d) {
                var line = getLine(i), first = i == head.line;
                var found = scan(line, first && forward ? pos + 1 : 0, first && !forward ? pos : line.text.length);
                if (found) break;
            }
            if (!found) found = {pos: null, match: false};
            var style = found.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
            var one = markText({line: head.line, ch: pos}, {line: head.line, ch: pos + 1}, style),
                two = found.pos != null && markText({line: i, ch: found.pos}, {line: i, ch: found.pos + 1}, style);
            var clear = operation(function () {
                one.clear();
                two && two.clear();
            });
            if (autoclear) setTimeout(clear, 800);
            else bracketHighlighted = clear;
        }

        // Finds the line to start with when starting a parse. Tries to
        // find a line with a stateAfter, so that it can start with a
        // valid state. If that fails, it returns the line with the
        // smallest indentation, which tends to need the least context to
        // parse correctly.
        function findStartLine(n) {
            var minindent, minline;
            for (var search = n, lim = n - 40; search > lim; --search) {
                if (search == 0) return 0;
                var line = getLine(search - 1);
                if (line.stateAfter) return search;
                var indented = line.indentation(options.tabSize);
                if (minline == null || minindent > indented) {
                    minline = search - 1;
                    minindent = indented;
                }
            }
            return minline;
        }

        function getStateBefore(n) {
            var start = findStartLine(n), state = start && getLine(start - 1).stateAfter;
            if (!state) state = startState(mode);
            else state = copyState(mode, state);
            doc.iter(start, n, function (line) {
                line.highlight(mode, state, options.tabSize);
                line.stateAfter = copyState(mode, state);
            });
            if (start < n) changes.push({from: start, to: n});
            if (n < doc.size && !getLine(n).stateAfter) work.push(n);
            return state;
        }

        function highlightLines(start, end) {
            var state = getStateBefore(start);
            doc.iter(start, end, function (line) {
                line.highlight(mode, state, options.tabSize);
                line.stateAfter = copyState(mode, state);
            });
        }

        function highlightWorker() {
            var end = +new Date + options.workTime;
            var foundWork = work.length;
            while (work.length) {
                if (!getLine(showingFrom).stateAfter) var task = showingFrom;
                else var task = work.pop();
                if (task >= doc.size) continue;
                var start = findStartLine(task), state = start && getLine(start - 1).stateAfter;
                if (state) state = copyState(mode, state);
                else state = startState(mode);

                var unchanged = 0, compare = mode.compareStates, realChange = false,
                    i = start, bail = false;
                doc.iter(i, doc.size, function (line) {
                    var hadState = line.stateAfter;
                    if (+new Date > end) {
                        work.push(i);
                        startWorker(options.workDelay);
                        if (realChange) changes.push({from: task, to: i + 1});
                        return (bail = true);
                    }
                    var changed = line.highlight(mode, state, options.tabSize);
                    if (changed) realChange = true;
                    line.stateAfter = copyState(mode, state);
                    var done = null;
                    if (compare) {
                        var same = hadState && compare(hadState, state);
                        if (same != Pass) done = !!same;
                    }
                    if (done == null) {
                        if (changed !== false || !hadState) unchanged = 0;
                        else if (++unchanged > 3 && (!mode.indent || mode.indent(hadState, "") == mode.indent(state, "")))
                            done = true;
                    }
                    if (done) return true;
                    ++i;
                });
                if (bail) return;
                if (realChange) changes.push({from: task, to: i + 1});
            }
            if (foundWork && options.onHighlightComplete)
                options.onHighlightComplete(instance);
        }

        function startWorker(time) {
            if (!work.length) return;
            highlight.set(time, operation(highlightWorker));
        }

        // Operations are used to wrap changes in such a way that each
        // change won't have to update the cursor and display (which would
        // be awkward, slow, and error-prone), but instead updates are
        // batched and then all combined and executed at once.
        function startOperation() {
            updateInput = userSelChange = textChanged = null;
            changes = [];
            selectionChanged = false;
            callbacks = [];
        }

        function endOperation() {
            var reScroll = false, updated;
            if (maxLengthChanged) computeMaxLength();
            if (selectionChanged) reScroll = !scrollCursorIntoView();
            if (changes.length) updated = updateDisplay(changes, true);
            else {
                if (selectionChanged) updateSelection();
                if (gutterDirty) updateGutter();
            }
            if (reScroll) scrollCursorIntoView();
            if (selectionChanged) {
                scrollEditorIntoView();
                restartBlink();
            }

            if (focused && !leaveInputAlone &&
                (updateInput === true || (updateInput !== false && selectionChanged)))
                resetInput(userSelChange);

            if (selectionChanged && options.matchBrackets)
                setTimeout(operation(function () {
                    if (bracketHighlighted) {
                        bracketHighlighted();
                        bracketHighlighted = null;
                    }
                    if (posEq(sel.from, sel.to)) matchBrackets(false);
                }), 20);
            var tc = textChanged, cbs = callbacks; // these can be reset by callbacks
            if (selectionChanged && options.onCursorActivity)
                options.onCursorActivity(instance);
            if (tc && options.onChange && instance)
                options.onChange(instance, tc);
            for (var i = 0; i < cbs.length; ++i) cbs[i](instance);
            if (updated && options.onUpdate) options.onUpdate(instance);
        }

        var nestedOperation = 0;

        function operation(f) {
            return function () {
                if (!nestedOperation++) startOperation();
                try {
                    var result = f.apply(this, arguments);
                }
                finally {
                    if (!--nestedOperation) endOperation();
                }
                return result;
            };
        }

        function compoundChange(f) {
            history.startCompound();
            try {
                return f();
            } finally {
                history.endCompound();
            }
        }

        for (var ext in extensions)
            if (extensions.propertyIsEnumerable(ext) && !instance.propertyIsEnumerable(ext))
                instance[ext] = extensions[ext];
        return instance;
    } // (end of function CodeMirror)

    // The default configuration options.
    CodeMirror.defaults = {
        value: "",
        mode: null,
        theme: "default",
        indentUnit: 2,
        indentWithTabs: false,
        smartIndent: true,
        tabSize: 4,
        keyMap: "default",
        extraKeys: null,
        electricChars: true,
        autoClearEmptyLines: false,
        onKeyEvent: null,
        onDragEvent: null,
        lineWrapping: false,
        lineNumbers: false,
        gutter: false,
        fixedGutter: false,
        firstLineNumber: 1,
        readOnly: false,
        dragDrop: true,
        onChange: null,
        onCursorActivity: null,
        onGutterClick: null,
        onHighlightComplete: null,
        onUpdate: null,
        onFocus: null, onBlur: null, onScroll: null,
        matchBrackets: false,
        workTime: 100,
        workDelay: 200,
        pollInterval: 100,
        undoDepth: 40,
        tabindex: null,
        autofocus: null
    };

    var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);
    var mac = ios || /Mac/.test(navigator.platform);
    var win = /Win/.test(navigator.platform);

    // Known modes, by name and by MIME
    var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};
    CodeMirror.defineMode = function (name, mode) {
        if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;
        if (arguments.length > 2) {
            mode.dependencies = [];
            for (var i = 2; i < arguments.length; ++i) mode.dependencies.push(arguments[i]);
        }
        modes[name] = mode;
    };
    CodeMirror.defineMIME = function (mime, spec) {
        mimeModes[mime] = spec;
    };
    CodeMirror.resolveMode = function (spec) {
        if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
            spec = mimeModes[spec];
        else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec))
            return CodeMirror.resolveMode("application/xml");
        if (typeof spec == "string") return {name: spec};
        else return spec || {name: "null"};
    };
    CodeMirror.getMode = function (options, spec) {
        var spec = CodeMirror.resolveMode(spec);
        var mfactory = modes[spec.name];
        if (!mfactory) return CodeMirror.getMode(options, "text/plain");
        return mfactory(options, spec);
    };
    CodeMirror.listModes = function () {
        var list = [];
        for (var m in modes)
            if (modes.propertyIsEnumerable(m)) list.push(m);
        return list;
    };
    CodeMirror.listMIMEs = function () {
        var list = [];
        for (var m in mimeModes)
            if (mimeModes.propertyIsEnumerable(m)) list.push({mime: m, mode: mimeModes[m]});
        return list;
    };

    var extensions = CodeMirror.extensions = {};
    CodeMirror.defineExtension = function (name, func) {
        extensions[name] = func;
    };

    var commands = CodeMirror.commands = {
        selectAll: function (cm) {
            cm.setSelection({line: 0, ch: 0}, {line: cm.lineCount() - 1});
        },
        killLine: function (cm) {
            var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);
            if (!sel && cm.getLine(from.line).length == from.ch) cm.replaceRange("", from, {
                line: from.line + 1,
                ch: 0
            });
            else cm.replaceRange("", from, sel ? to : {line: from.line});
        },
        deleteLine: function (cm) {
            var l = cm.getCursor().line;
            cm.replaceRange("", {line: l, ch: 0}, {line: l});
        },
        undo: function (cm) {
            cm.undo();
        },
        redo: function (cm) {
            cm.redo();
        },
        goDocStart: function (cm) {
            cm.setCursor(0, 0, true);
        },
        goDocEnd: function (cm) {
            cm.setSelection({line: cm.lineCount() - 1}, null, true);
        },
        goLineStart: function (cm) {
            cm.setCursor(cm.getCursor().line, 0, true);
        },
        goLineStartSmart: function (cm) {
            var cur = cm.getCursor();
            var text = cm.getLine(cur.line), firstNonWS = Math.max(0, text.search(/\S/));
            cm.setCursor(cur.line, cur.ch <= firstNonWS && cur.ch ? 0 : firstNonWS, true);
        },
        goLineEnd: function (cm) {
            cm.setSelection({line: cm.getCursor().line}, null, true);
        },
        goLineUp: function (cm) {
            cm.moveV(-1, "line");
        },
        goLineDown: function (cm) {
            cm.moveV(1, "line");
        },
        goPageUp: function (cm) {
            cm.moveV(-1, "page");
        },
        goPageDown: function (cm) {
            cm.moveV(1, "page");
        },
        goCharLeft: function (cm) {
            cm.moveH(-1, "char");
        },
        goCharRight: function (cm) {
            cm.moveH(1, "char");
        },
        goColumnLeft: function (cm) {
            cm.moveH(-1, "column");
        },
        goColumnRight: function (cm) {
            cm.moveH(1, "column");
        },
        goWordLeft: function (cm) {
            cm.moveH(-1, "word");
        },
        goWordRight: function (cm) {
            cm.moveH(1, "word");
        },
        delCharLeft: function (cm) {
            cm.deleteH(-1, "char");
        },
        delCharRight: function (cm) {
            cm.deleteH(1, "char");
        },
        delWordLeft: function (cm) {
            cm.deleteH(-1, "word");
        },
        delWordRight: function (cm) {
            cm.deleteH(1, "word");
        },
        indentAuto: function (cm) {
            cm.indentSelection("smart");
        },
        indentMore: function (cm) {
            cm.indentSelection("add");
        },
        indentLess: function (cm) {
            cm.indentSelection("subtract");
        },
        insertTab: function (cm) {
            cm.replaceSelection("\t", "end");
        },
        defaultTab: function (cm) {
            if (cm.somethingSelected()) cm.indentSelection("add");
            else cm.replaceSelection("\t", "end");
        },
        transposeChars: function (cm) {
            var cur = cm.getCursor(), line = cm.getLine(cur.line);
            if (cur.ch > 0 && cur.ch < line.length - 1)
                cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),
                    {line: cur.line, ch: cur.ch - 1}, {line: cur.line, ch: cur.ch + 1});
        },
        newlineAndIndent: function (cm) {
            cm.replaceSelection("\n", "end");
            cm.indentLine(cm.getCursor().line);
        },
        toggleOverwrite: function (cm) {
            cm.toggleOverwrite();
        }
    };

    var keyMap = CodeMirror.keyMap = {};
    keyMap.basic = {
        "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
        "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
        "Delete": "delCharRight", "Backspace": "delCharLeft", "Tab": "defaultTab", "Shift-Tab": "indentAuto",
        "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"
    };
    // Note that the save and find-related commands aren't defined by
    // default. Unknown commands are simply ignored.
    keyMap.pcDefault = {
        "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
        "Ctrl-Home": "goDocStart", "Alt-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",
        "Ctrl-Left": "goWordLeft", "Ctrl-Right": "goWordRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
        "Ctrl-Backspace": "delWordLeft", "Ctrl-Delete": "delWordRight", "Ctrl-S": "save", "Ctrl-F": "find",
        "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
        "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
        fallthrough: "basic"
    };
    keyMap.macDefault = {
        "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
        "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goWordLeft",
        "Alt-Right": "goWordRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delWordLeft",
        "Ctrl-Alt-Backspace": "delWordRight", "Alt-Delete": "delWordRight", "Cmd-S": "save", "Cmd-F": "find",
        "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
        "Cmd-[": "indentLess", "Cmd-]": "indentMore",
        fallthrough: ["basic", "emacsy"]
    };
    keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;
    keyMap.emacsy = {
        "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
        "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
        "Ctrl-V": "goPageUp", "Shift-Ctrl-V": "goPageDown", "Ctrl-D": "delCharRight", "Ctrl-H": "delCharLeft",
        "Alt-D": "delWordRight", "Alt-Backspace": "delWordLeft", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"
    };

    function getKeyMap(val) {
        if (typeof val == "string") return keyMap[val];
        else return val;
    }

    function lookupKey(name, extraMap, map, handle, stop) {
        function lookup(map) {
            map = getKeyMap(map);
            var found = map[name];
            if (found != null && handle(found)) return true;
            if (map.nofallthrough) {
                if (stop) stop();
                return true;
            }
            var fallthrough = map.fallthrough;
            if (fallthrough == null) return false;
            if (Object.prototype.toString.call(fallthrough) != "[object Array]")
                return lookup(fallthrough);
            for (var i = 0, e = fallthrough.length; i < e; ++i) {
                if (lookup(fallthrough[i])) return true;
            }
            return false;
        }

        if (extraMap && lookup(extraMap)) return true;
        return lookup(map);
    }

    function isModifierKey(event) {
        var name = keyNames[e_prop(event, "keyCode")];
        return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";
    }

    CodeMirror.fromTextArea = function (textarea, options) {
        if (!options) options = {};
        options.value = textarea.value;
        if (!options.tabindex && textarea.tabindex)
            options.tabindex = textarea.tabindex;
        if (options.autofocus == null && textarea.getAttribute("autofocus") != null)
            options.autofocus = true;

        function save() {
            textarea.value = instance.getValue();
        }

        if (textarea.form) {
            // Deplorable hack to make the submit method do the right thing.
            var rmSubmit = connect(textarea.form, "submit", save, true);
            if (typeof textarea.form.submit == "function") {
                var realSubmit = textarea.form.submit;

                function wrappedSubmit() {
                    save();
                    textarea.form.submit = realSubmit;
                    textarea.form.submit();
                    textarea.form.submit = wrappedSubmit;
                }

                textarea.form.submit = wrappedSubmit;
            }
        }

        textarea.style.display = "none";
        var instance = CodeMirror(function (node) {
            textarea.parentNode.insertBefore(node, textarea.nextSibling);
        }, options);
        instance.save = save;
        instance.getTextArea = function () {
            return textarea;
        };
        instance.toTextArea = function () {
            save();
            textarea.parentNode.removeChild(instance.getWrapperElement());
            textarea.style.display = "";
            if (textarea.form) {
                rmSubmit();
                if (typeof textarea.form.submit == "function")
                    textarea.form.submit = realSubmit;
            }
        };
        return instance;
    };

    // Utility functions for working with state. Exported because modes
    // sometimes need to do this.
    function copyState(mode, state) {
        if (state === true) return state;
        if (mode.copyState) return mode.copyState(state);
        var nstate = {};
        for (var n in state) {
            var val = state[n];
            if (val instanceof Array) val = val.concat([]);
            nstate[n] = val;
        }
        return nstate;
    }

    CodeMirror.copyState = copyState;
    function startState(mode, a1, a2) {
        return mode.startState ? mode.startState(a1, a2) : true;
    }

    CodeMirror.startState = startState;

    // The character stream used by a mode's parser.
    function StringStream(string, tabSize) {
        this.pos = this.start = 0;
        this.string = string;
        this.tabSize = tabSize || 8;
    }

    StringStream.prototype = {
        eol: function () {
            return this.pos >= this.string.length;
        },
        sol: function () {
            return this.pos == 0;
        },
        peek: function () {
            return this.string.charAt(this.pos);
        },
        next: function () {
            if (this.pos < this.string.length)
                return this.string.charAt(this.pos++);
        },
        eat: function (match) {
            var ch = this.string.charAt(this.pos);
            if (typeof match == "string") var ok = ch == match;
            else var ok = ch && (match.test ? match.test(ch) : match(ch));
            if (ok) {
                ++this.pos;
                return ch;
            }
        },
        eatWhile: function (match) {
            var start = this.pos;
            while (this.eat(match)) {
            }
            return this.pos > start;
        },
        eatSpace: function () {
            var start = this.pos;
            while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
            return this.pos > start;
        },
        skipToEnd: function () {
            this.pos = this.string.length;
        },
        skipTo: function (ch) {
            var found = this.string.indexOf(ch, this.pos);
            if (found > -1) {
                this.pos = found;
                return true;
            }
        },
        backUp: function (n) {
            this.pos -= n;
        },
        column: function () {
            return countColumn(this.string, this.start, this.tabSize);
        },
        indentation: function () {
            return countColumn(this.string, null, this.tabSize);
        },
        match: function (pattern, consume, caseInsensitive) {
            if (typeof pattern == "string") {
                function cased(str) {
                    return caseInsensitive ? str.toLowerCase() : str;
                }

                if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
                    if (consume !== false) this.pos += pattern.length;
                    return true;
                }
            }
            else {
                var match = this.string.slice(this.pos).match(pattern);
                if (match && consume !== false) this.pos += match[0].length;
                return match;
            }
        },
        current: function () {
            return this.string.slice(this.start, this.pos);
        }
    };
    CodeMirror.StringStream = StringStream;

    function MarkedText(from, to, className, marker) {
        this.from = from;
        this.to = to;
        this.style = className;
        this.marker = marker;
    }

    MarkedText.prototype = {
        attach: function (line) {
            this.marker.set.push(line);
        },
        detach: function (line) {
            var ix = indexOf(this.marker.set, line);
            if (ix > -1) this.marker.set.splice(ix, 1);
        },
        split: function (pos, lenBefore) {
            if (this.to <= pos && this.to != null) return null;
            var from = this.from < pos || this.from == null ? null : this.from - pos + lenBefore;
            var to = this.to == null ? null : this.to - pos + lenBefore;
            return new MarkedText(from, to, this.style, this.marker);
        },
        dup: function () {
            return new MarkedText(null, null, this.style, this.marker);
        },
        clipTo: function (fromOpen, from, toOpen, to, diff) {
            if (fromOpen && to > this.from && (to < this.to || this.to == null))
                this.from = null;
            else if (this.from != null && this.from >= from)
                this.from = Math.max(to, this.from) + diff;
            if (toOpen && (from < this.to || this.to == null) && (from > this.from || this.from == null))
                this.to = null;
            else if (this.to != null && this.to > from)
                this.to = to < this.to ? this.to + diff : from;
        },
        isDead: function () {
            return this.from != null && this.to != null && this.from >= this.to;
        },
        sameSet: function (x) {
            return this.marker == x.marker;
        }
    };

    function Bookmark(pos) {
        this.from = pos;
        this.to = pos;
        this.line = null;
    }

    Bookmark.prototype = {
        attach: function (line) {
            this.line = line;
        },
        detach: function (line) {
            if (this.line == line) this.line = null;
        },
        split: function (pos, lenBefore) {
            if (pos < this.from) {
                this.from = this.to = (this.from - pos) + lenBefore;
                return this;
            }
        },
        isDead: function () {
            return this.from > this.to;
        },
        clipTo: function (fromOpen, from, toOpen, to, diff) {
            if ((fromOpen || from < this.from) && (toOpen || to > this.to)) {
                this.from = 0;
                this.to = -1;
            } else if (this.from > from) {
                this.from = this.to = Math.max(to, this.from) + diff;
            }
        },
        sameSet: function (x) {
            return false;
        },
        find: function () {
            if (!this.line || !this.line.parent) return null;
            return {line: lineNo(this.line), ch: this.from};
        },
        clear: function () {
            if (this.line) {
                var found = indexOf(this.line.marked, this);
                if (found != -1) this.line.marked.splice(found, 1);
                this.line = null;
            }
        }
    };

    // Line objects. These hold state related to a line, including
    // highlighting info (the styles array).
    function Line(text, styles) {
        this.styles = styles || [text, null];
        this.text = text;
        this.height = 1;
        this.marked = this.gutterMarker = this.className = this.bgClassName = this.handlers = null;
        this.stateAfter = this.parent = this.hidden = null;
    }

    Line.inheritMarks = function (text, orig) {
        var ln = new Line(text), mk = orig && orig.marked;
        if (mk) {
            for (var i = 0; i < mk.length; ++i) {
                if (mk[i].to == null && mk[i].style) {
                    var newmk = ln.marked || (ln.marked = []), mark = mk[i];
                    var nmark = mark.dup();
                    newmk.push(nmark);
                    nmark.attach(ln);
                }
            }
        }
        return ln;
    }
    Line.prototype = {
        // Replace a piece of a line, keeping the styles around it intact.
        replace: function (from, to_, text) {
            var st = [], mk = this.marked, to = to_ == null ? this.text.length : to_;
            copyStyles(0, from, this.styles, st);
            if (text) st.push(text, null);
            copyStyles(to, this.text.length, this.styles, st);
            this.styles = st;
            this.text = this.text.slice(0, from) + text + this.text.slice(to);
            this.stateAfter = null;
            if (mk) {
                var diff = text.length - (to - from);
                for (var i = 0; i < mk.length; ++i) {
                    var mark = mk[i];
                    mark.clipTo(from == null, from || 0, to_ == null, to, diff);
                    if (mark.isDead()) {
                        mark.detach(this);
                        mk.splice(i--, 1);
                    }
                }
            }
        },
        // Split a part off a line, keeping styles and markers intact.
        split: function (pos, textBefore) {
            var st = [textBefore, null], mk = this.marked;
            copyStyles(pos, this.text.length, this.styles, st);
            var taken = new Line(textBefore + this.text.slice(pos), st);
            if (mk) {
                for (var i = 0; i < mk.length; ++i) {
                    var mark = mk[i];
                    var newmark = mark.split(pos, textBefore.length);
                    if (newmark) {
                        if (!taken.marked) taken.marked = [];
                        taken.marked.push(newmark);
                        newmark.attach(taken);
                        if (newmark == mark) mk.splice(i--, 1);
                    }
                }
            }
            return taken;
        },
        append: function (line) {
            var mylen = this.text.length, mk = line.marked, mymk = this.marked;
            this.text += line.text;
            copyStyles(0, line.text.length, line.styles, this.styles);
            if (mymk) {
                for (var i = 0; i < mymk.length; ++i)
                    if (mymk[i].to == null) mymk[i].to = mylen;
            }
            if (mk && mk.length) {
                if (!mymk) this.marked = mymk = [];
                outer: for (var i = 0; i < mk.length; ++i) {
                    var mark = mk[i];
                    if (!mark.from) {
                        for (var j = 0; j < mymk.length; ++j) {
                            var mymark = mymk[j];
                            if (mymark.to == mylen && mymark.sameSet(mark)) {
                                mymark.to = mark.to == null ? null : mark.to + mylen;
                                if (mymark.isDead()) {
                                    mymark.detach(this);
                                    mk.splice(i--, 1);
                                }
                                continue outer;
                            }
                        }
                    }
                    mymk.push(mark);
                    mark.attach(this);
                    mark.from += mylen;
                    if (mark.to != null) mark.to += mylen;
                }
            }
        },
        fixMarkEnds: function (other) {
            var mk = this.marked, omk = other.marked;
            if (!mk) return;
            for (var i = 0; i < mk.length; ++i) {
                var mark = mk[i], close = mark.to == null;
                if (close && omk) {
                    for (var j = 0; j < omk.length; ++j)
                        if (omk[j].sameSet(mark)) {
                            close = false;
                            break;
                        }
                }
                if (close) mark.to = this.text.length;
            }
        },
        fixMarkStarts: function () {
            var mk = this.marked;
            if (!mk) return;
            for (var i = 0; i < mk.length; ++i)
                if (mk[i].from == null) mk[i].from = 0;
        },
        addMark: function (mark) {
            mark.attach(this);
            if (this.marked == null) this.marked = [];
            this.marked.push(mark);
            this.marked.sort(function (a, b) {
                return (a.from || 0) - (b.from || 0);
            });
        },
        // Run the given mode's parser over a line, update the styles
        // array, which contains alternating fragments of text and CSS
        // classes.
        highlight: function (mode, state, tabSize) {
            var stream = new StringStream(this.text, tabSize), st = this.styles, pos = 0;
            var changed = false, curWord = st[0], prevWord;
            if (this.text == "" && mode.blankLine) mode.blankLine(state);
            while (!stream.eol()) {
                var style = mode.token(stream, state);
                var substr = this.text.slice(stream.start, stream.pos);
                stream.start = stream.pos;
                if (pos && st[pos - 1] == style)
                    st[pos - 2] += substr;
                else if (substr) {
                    if (!changed && (st[pos + 1] != style || (pos && st[pos - 2] != prevWord))) changed = true;
                    st[pos++] = substr;
                    st[pos++] = style;
                    prevWord = curWord;
                    curWord = st[pos];
                }
                // Give up when line is ridiculously long
                if (stream.pos > 5000) {
                    st[pos++] = this.text.slice(stream.pos);
                    st[pos++] = null;
                    break;
                }
            }
            if (st.length != pos) {
                st.length = pos;
                changed = true;
            }
            if (pos && st[pos - 2] != prevWord) changed = true;
            // Short lines with simple highlights return null, and are
            // counted as changed by the driver because they are likely to
            // highlight the same way in various contexts.
            return changed || (st.length < 5 && this.text.length < 10 ? null : false);
        },
        // Fetch the parser token for a given character. Useful for hacks
        // that want to inspect the mode state (say, for completion).
        getTokenAt: function (mode, state, ch) {
            var txt = this.text, stream = new StringStream(txt);
            while (stream.pos < ch && !stream.eol()) {
                stream.start = stream.pos;
                var style = mode.token(stream, state);
            }
            return {
                start: stream.start,
                end: stream.pos,
                string: stream.current(),
                className: style || null,
                state: state
            };
        },
        indentation: function (tabSize) {
            return countColumn(this.text, null, tabSize);
        },
        // Produces an HTML fragment for the line, taking selection,
        // marking, and highlighting into account.
        getHTML: function (makeTab, wrapAt, wrapId, wrapWBR) {
            var html = [], first = true, col = 0;

            function span_(text, style) {
                if (!text) return;
                // Work around a bug where, in some compat modes, IE ignores leading spaces
                if (first && ie && text.charAt(0) == " ") text = "\u00a0" + text.slice(1);
                first = false;
                if (text.indexOf("\t") == -1) {
                    col += text.length;
                    var escaped = htmlEscape(text);
                } else {
                    var escaped = "";
                    for (var pos = 0; ;) {
                        var idx = text.indexOf("\t", pos);
                        if (idx == -1) {
                            escaped += htmlEscape(text.slice(pos));
                            col += text.length - pos;
                            break;
                        } else {
                            col += idx - pos;
                            var tab = makeTab(col);
                            escaped += htmlEscape(text.slice(pos, idx)) + tab.html;
                            col += tab.width;
                            pos = idx + 1;
                        }
                    }
                }
                if (style) html.push('<span class="', style, '">', escaped, "</span>");
                else html.push(escaped);
            }

            var span = span_;
            if (wrapAt != null) {
                var outPos = 0, open = "<span id=\"" + wrapId + "\">";
                span = function (text, style) {
                    var l = text.length;
                    if (wrapAt >= outPos && wrapAt < outPos + l) {
                        if (wrapAt > outPos) {
                            span_(text.slice(0, wrapAt - outPos), style);
                            // See comment at the definition of spanAffectsWrapping
                            if (wrapWBR) html.push("<wbr>");
                        }
                        html.push(open);
                        var cut = wrapAt - outPos;
                        span_(window.opera ? text.slice(cut, cut + 1) : text.slice(cut), style);
                        html.push("</span>");
                        if (window.opera) span_(text.slice(cut + 1), style);
                        wrapAt--;
                        outPos += l;
                    } else {
                        outPos += l;
                        span_(text, style);
                        // Output empty wrapper when at end of line
                        if (outPos == wrapAt && outPos == len) html.push(open + " </span>");
                        // Stop outputting HTML when gone sufficiently far beyond measure
                        else if (outPos > wrapAt + 10 && /\s/.test(text)) span = function () {
                        };
                    }
                }
            }

            var st = this.styles, allText = this.text, marked = this.marked;
            var len = allText.length;

            function styleToClass(style) {
                if (!style) return null;
                return "cm-" + style.replace(/ +/g, " cm-");
            }

            if (!allText && wrapAt == null) {
                span(" ");
            } else if (!marked || !marked.length) {
                for (var i = 0, ch = 0; ch < len; i += 2) {
                    var str = st[i], style = st[i + 1], l = str.length;
                    if (ch + l > len) str = str.slice(0, len - ch);
                    ch += l;
                    span(str, styleToClass(style));
                }
            } else {
                var pos = 0, i = 0, text = "", style, sg = 0;
                var nextChange = marked[0].from || 0, marks = [], markpos = 0;

                function advanceMarks() {
                    var m;
                    while (markpos < marked.length &&
                    ((m = marked[markpos]).from == pos || m.from == null)) {
                        if (m.style != null) marks.push(m);
                        ++markpos;
                    }
                    nextChange = markpos < marked.length ? marked[markpos].from : Infinity;
                    for (var i = 0; i < marks.length; ++i) {
                        var to = marks[i].to || Infinity;
                        if (to == pos) marks.splice(i--, 1);
                        else nextChange = Math.min(to, nextChange);
                    }
                }

                var m = 0;
                while (pos < len) {
                    if (nextChange == pos) advanceMarks();
                    var upto = Math.min(len, nextChange);
                    while (true) {
                        if (text) {
                            var end = pos + text.length;
                            var appliedStyle = style;
                            for (var j = 0; j < marks.length; ++j)
                                appliedStyle = (appliedStyle ? appliedStyle + " " : "") + marks[j].style;
                            span(end > upto ? text.slice(0, upto - pos) : text, appliedStyle);
                            if (end >= upto) {
                                text = text.slice(upto - pos);
                                pos = upto;
                                break;
                            }
                            pos = end;
                        }
                        text = st[i++];
                        style = styleToClass(st[i++]);
                    }
                }
            }
            return html.join("");
        },
        cleanUp: function () {
            this.parent = null;
            if (this.marked)
                for (var i = 0, e = this.marked.length; i < e; ++i) this.marked[i].detach(this);
        }
    };
    // Utility used by replace and split above
    function copyStyles(from, to, source, dest) {
        for (var i = 0, pos = 0, state = 0; pos < to; i += 2) {
            var part = source[i], end = pos + part.length;
            if (state == 0) {
                if (end > from) dest.push(part.slice(from - pos, Math.min(part.length, to - pos)), source[i + 1]);
                if (end >= from) state = 1;
            }
            else if (state == 1) {
                if (end > to) dest.push(part.slice(0, to - pos), source[i + 1]);
                else dest.push(part, source[i + 1]);
            }
            pos = end;
        }
    }

    // Data structure that holds the sequence of lines.
    function LeafChunk(lines) {
        this.lines = lines;
        this.parent = null;
        for (var i = 0, e = lines.length, height = 0; i < e; ++i) {
            lines[i].parent = this;
            height += lines[i].height;
        }
        this.height = height;
    }

    LeafChunk.prototype = {
        chunkSize: function () {
            return this.lines.length;
        },
        remove: function (at, n, callbacks) {
            for (var i = at, e = at + n; i < e; ++i) {
                var line = this.lines[i];
                this.height -= line.height;
                line.cleanUp();
                if (line.handlers)
                    for (var j = 0; j < line.handlers.length; ++j) callbacks.push(line.handlers[j]);
            }
            this.lines.splice(at, n);
        },
        collapse: function (lines) {
            lines.splice.apply(lines, [lines.length, 0].concat(this.lines));
        },
        insertHeight: function (at, lines, height) {
            this.height += height;
            this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
            for (var i = 0, e = lines.length; i < e; ++i) lines[i].parent = this;
        },
        iterN: function (at, n, op) {
            for (var e = at + n; at < e; ++at)
                if (op(this.lines[at])) return true;
        }
    };
    function BranchChunk(children) {
        this.children = children;
        var size = 0, height = 0;
        for (var i = 0, e = children.length; i < e; ++i) {
            var ch = children[i];
            size += ch.chunkSize();
            height += ch.height;
            ch.parent = this;
        }
        this.size = size;
        this.height = height;
        this.parent = null;
    }

    BranchChunk.prototype = {
        chunkSize: function () {
            return this.size;
        },
        remove: function (at, n, callbacks) {
            this.size -= n;
            for (var i = 0; i < this.children.length; ++i) {
                var child = this.children[i], sz = child.chunkSize();
                if (at < sz) {
                    var rm = Math.min(n, sz - at), oldHeight = child.height;
                    child.remove(at, rm, callbacks);
                    this.height -= oldHeight - child.height;
                    if (sz == rm) {
                        this.children.splice(i--, 1);
                        child.parent = null;
                    }
                    if ((n -= rm) == 0) break;
                    at = 0;
                } else at -= sz;
            }
            if (this.size - n < 25) {
                var lines = [];
                this.collapse(lines);
                this.children = [new LeafChunk(lines)];
                this.children[0].parent = this;
            }
        },
        collapse: function (lines) {
            for (var i = 0, e = this.children.length; i < e; ++i) this.children[i].collapse(lines);
        },
        insert: function (at, lines) {
            var height = 0;
            for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;
            this.insertHeight(at, lines, height);
        },
        insertHeight: function (at, lines, height) {
            this.size += lines.length;
            this.height += height;
            for (var i = 0, e = this.children.length; i < e; ++i) {
                var child = this.children[i], sz = child.chunkSize();
                if (at <= sz) {
                    child.insertHeight(at, lines, height);
                    if (child.lines && child.lines.length > 50) {
                        while (child.lines.length > 50) {
                            var spilled = child.lines.splice(child.lines.length - 25, 25);
                            var newleaf = new LeafChunk(spilled);
                            child.height -= newleaf.height;
                            this.children.splice(i + 1, 0, newleaf);
                            newleaf.parent = this;
                        }
                        this.maybeSpill();
                    }
                    break;
                }
                at -= sz;
            }
        },
        maybeSpill: function () {
            if (this.children.length <= 10) return;
            var me = this;
            do {
                var spilled = me.children.splice(me.children.length - 5, 5);
                var sibling = new BranchChunk(spilled);
                if (!me.parent) { // Become the parent node
                    var copy = new BranchChunk(me.children);
                    copy.parent = me;
                    me.children = [copy, sibling];
                    me = copy;
                } else {
                    me.size -= sibling.size;
                    me.height -= sibling.height;
                    var myIndex = indexOf(me.parent.children, me);
                    me.parent.children.splice(myIndex + 1, 0, sibling);
                }
                sibling.parent = me.parent;
            } while (me.children.length > 10);
            me.parent.maybeSpill();
        },
        iter: function (from, to, op) {
            this.iterN(from, to - from, op);
        },
        iterN: function (at, n, op) {
            for (var i = 0, e = this.children.length; i < e; ++i) {
                var child = this.children[i], sz = child.chunkSize();
                if (at < sz) {
                    var used = Math.min(n, sz - at);
                    if (child.iterN(at, used, op)) return true;
                    if ((n -= used) == 0) break;
                    at = 0;
                } else at -= sz;
            }
        }
    };

    function getLineAt(chunk, n) {
        while (!chunk.lines) {
            for (var i = 0; ; ++i) {
                var child = chunk.children[i], sz = child.chunkSize();
                if (n < sz) {
                    chunk = child;
                    break;
                }
                n -= sz;
            }
        }
        return chunk.lines[n];
    }

    function lineNo(line) {
        if (line.parent == null) return null;
        var cur = line.parent, no = indexOf(cur.lines, line);
        for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
            for (var i = 0, e = chunk.children.length; ; ++i) {
                if (chunk.children[i] == cur) break;
                no += chunk.children[i].chunkSize();
            }
        }
        return no;
    }

    function lineAtHeight(chunk, h) {
        var n = 0;
        outer: do {
            for (var i = 0, e = chunk.children.length; i < e; ++i) {
                var child = chunk.children[i], ch = child.height;
                if (h < ch) {
                    chunk = child;
                    continue outer;
                }
                h -= ch;
                n += child.chunkSize();
            }
            return n;
        } while (!chunk.lines);
        for (var i = 0, e = chunk.lines.length; i < e; ++i) {
            var line = chunk.lines[i], lh = line.height;
            if (h < lh) break;
            h -= lh;
        }
        return n + i;
    }

    function heightAtLine(chunk, n) {
        var h = 0;
        outer: do {
            for (var i = 0, e = chunk.children.length; i < e; ++i) {
                var child = chunk.children[i], sz = child.chunkSize();
                if (n < sz) {
                    chunk = child;
                    continue outer;
                }
                n -= sz;
                h += child.height;
            }
            return h;
        } while (!chunk.lines);
        for (var i = 0; i < n; ++i) h += chunk.lines[i].height;
        return h;
    }

    // The history object 'chunks' changes that are made close together
    // and at almost the same time into bigger undoable units.
    function History() {
        this.time = 0;
        this.done = [];
        this.undone = [];
        this.compound = 0;
        this.closed = false;
    }

    History.prototype = {
        addChange: function (start, added, old) {
            this.undone.length = 0;
            var time = +new Date, cur = this.done[this.done.length - 1], last = cur && cur[cur.length - 1];
            var dtime = time - this.time;

            if (this.compound && cur && !this.closed) {
                cur.push({start: start, added: added, old: old});
            } else if (dtime > 400 || !last || this.closed ||
                last.start > start + old.length || last.start + last.added < start) {
                this.done.push([{start: start, added: added, old: old}]);
                this.closed = false;
            } else {
                var startBefore = Math.max(0, last.start - start),
                    endAfter = Math.max(0, (start + old.length) - (last.start + last.added));
                for (var i = startBefore; i > 0; --i) last.old.unshift(old[i - 1]);
                for (var i = endAfter; i > 0; --i) last.old.push(old[old.length - i]);
                if (startBefore) last.start = start;
                last.added += added - (old.length - startBefore - endAfter);
            }
            this.time = time;
        },
        startCompound: function () {
            if (!this.compound++) this.closed = true;
        },
        endCompound: function () {
            if (!--this.compound) this.closed = true;
        }
    };

    function stopMethod() {
        e_stop(this);
    }

    // Ensure an event has a stop method.
    function addStop(event) {
        if (!event.stop) event.stop = stopMethod;
        return event;
    }

    function e_preventDefault(e) {
        if (e.preventDefault) e.preventDefault();
        else e.returnValue = false;
    }

    function e_stopPropagation(e) {
        if (e.stopPropagation) e.stopPropagation();
        else e.cancelBubble = true;
    }

    function e_stop(e) {
        e_preventDefault(e);
        e_stopPropagation(e);
    }

    CodeMirror.e_stop = e_stop;
    CodeMirror.e_preventDefault = e_preventDefault;
    CodeMirror.e_stopPropagation = e_stopPropagation;

    function e_target(e) {
        return e.target || e.srcElement;
    }

    function e_button(e) {
        if (e.which) return e.which;
        else if (e.button & 1) return 1;
        else if (e.button & 2) return 3;
        else if (e.button & 4) return 2;
    }

    // Allow 3rd-party code to override event properties by adding an override
    // object to an event object.
    function e_prop(e, prop) {
        var overridden = e.override && e.override.hasOwnProperty(prop);
        return overridden ? e.override[prop] : e[prop];
    }

    // Event handler registration. If disconnect is true, it'll return a
    // function that unregisters the handler.
    function connect(node, type, handler, disconnect) {
        if (typeof node.addEventListener == "function") {
            node.addEventListener(type, handler, false);
            if (disconnect) return function () {
                node.removeEventListener(type, handler, false);
            };
        }
        else {
            var wrapHandler = function (event) {
                handler(event || window.event);
            };
            node.attachEvent("on" + type, wrapHandler);
            if (disconnect) return function () {
                node.detachEvent("on" + type, wrapHandler);
            };
        }
    }

    CodeMirror.connect = connect;

    function Delayed() {
        this.id = null;
    }

    Delayed.prototype = {
        set: function (ms, f) {
            clearTimeout(this.id);
            this.id = setTimeout(f, ms);
        }
    };

    var Pass = CodeMirror.Pass = {
        toString: function () {
            return "CodeMirror.Pass";
        }
    };

    var gecko = /gecko\/\d{7}/i.test(navigator.userAgent);
    var ie = /MSIE \d/.test(navigator.userAgent);
    var ie_lt9 = /MSIE [1-8]\b/.test(navigator.userAgent);
    var quirksMode = ie && document.documentMode == 5;
    var webkit = /WebKit\//.test(navigator.userAgent);
    var chrome = /Chrome\//.test(navigator.userAgent);
    var safari = /Apple Computer/.test(navigator.vendor);
    var khtml = /KHTML\//.test(navigator.userAgent);

    // Detect drag-and-drop
    var dragAndDrop = function () {
        // There is *some* kind of drag-and-drop support in IE6-8, but I
        // couldn't get it to work yet.
        if (ie_lt9) return false;
        var div = document.createElement('div');
        return "draggable" in div || "dragDrop" in div;
    }();

    // Feature-detect whether newlines in textareas are converted to \r\n
    var lineSep = function () {
        var te = document.createElement("textarea");
        te.value = "foo\nbar";
        if (te.value.indexOf("\r") > -1) return "\r\n";
        return "\n";
    }();

    // For a reason I have yet to figure out, some browsers disallow
    // word wrapping between certain characters *only* if a new inline
    // element is started between them. This makes it hard to reliably
    // measure the position of things, since that requires inserting an
    // extra span. This terribly fragile set of regexps matches the
    // character combinations that suffer from this phenomenon on the
    // various browsers.
    var spanAffectsWrapping = /^$/; // Won't match any two-character string
    if (gecko) spanAffectsWrapping = /$'/;
    else if (safari) spanAffectsWrapping = /\-[^ \-?]|\?[^ !'\"\),.\-\/:;\?\]\}]/;
    else if (chrome) spanAffectsWrapping = /\-[^ \-\.?]|\?[^ \-\.?\]\}:;!'\"\),\/]|[\.!\"#&%\)*+,:;=>\]|\}~][\(\{\[<]|\$'/;

    // Counts the column offset in a string, taking tabs into account.
    // Used mostly to find indentation.
    function countColumn(string, end, tabSize) {
        if (end == null) {
            end = string.search(/[^\s\u00a0]/);
            if (end == -1) end = string.length;
        }
        for (var i = 0, n = 0; i < end; ++i) {
            if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);
            else ++n;
        }
        return n;
    }

    function computedStyle(elt) {
        if (elt.currentStyle) return elt.currentStyle;
        return window.getComputedStyle(elt, null);
    }

    // Find the position of an element by following the offsetParent chain.
    // If screen==true, it returns screen (rather than page) coordinates.
    function eltOffset(node, screen) {
        var bod = node.ownerDocument.body;
        var x = 0, y = 0, skipBody = false;
        for (var n = node; n; n = n.col - md - offset - Parent) {
            var ol = n.col - md - offset - Left, ot = n.col - md - offset - Top;
            // Firefox reports weird inverted offsets when the body has a border.
            if (n == bod) {
                x += Math.abs(ol);
                y += Math.abs(ot);
            }
            else {
                x += ol, y += ot;
            }
            if (screen && computedStyle(n).position == "fixed")
                skipBody = true;
        }
        var e = screen && !skipBody ? null : bod;
        for (var n = node.parentNode; n != e; n = n.parentNode)
            if (n.scrollLeft != null) {
                x -= n.scrollLeft;
                y -= n.scrollTop;
            }
        return {left: x, top: y};
    }

    // Use the faster and saner getBoundingClientRect method when possible.
    if (document.documentElement.getBoundingClientRect != null) eltOffset = function (node, screen) {
        // Take the parts of bounding client rect that we are interested in so we are able to edit if need be,
        // since the returned value cannot be changed externally (they are kept in sync as the element moves within the page)
        try {
            var box = node.getBoundingClientRect();
            box = {top: box.top, left: box.left};
        }
        catch (e) {
            box = {top: 0, left: 0};
        }
        if (!screen) {
            // Get the toplevel scroll, working around browser differences.
            if (window.pageYOffset == null) {
                var t = document.documentElement || document.body.parentNode;
                if (t.scrollTop == null) t = document.body;
                box.top += t.scrollTop;
                box.left += t.scrollLeft;
            } else {
                box.top += window.pageYOffset;
                box.left += window.pageXOffset;
            }
        }
        return box;
    };

    // Get a node's text content.
    function eltText(node) {
        return node.textContent || node.innerText || node.nodeValue || "";
    }

    function selectInput(node) {
        if (ios) { // Mobile Safari apparently has a bug where select() is broken.
            node.selectionStart = 0;
            node.selectionEnd = node.value.length;
        } else node.select();
    }

    // Operations on {line, ch} objects.
    function posEq(a, b) {
        return a.line == b.line && a.ch == b.ch;
    }

    function posLess(a, b) {
        return a.line < b.line || (a.line == b.line && a.ch < b.ch);
    }

    function copyPos(x) {
        return {line: x.line, ch: x.ch};
    }

    var escapeElement = document.createElement("pre");

    function htmlEscape(str) {
        escapeElement.textContent = str;
        return escapeElement.innerHTML;
    }

    // Recent (late 2011) Opera betas insert bogus newlines at the start
    // of the textContent, so we strip those.
    if (htmlEscape("a") == "\na")
        htmlEscape = function (str) {
            escapeElement.textContent = str;
            return escapeElement.innerHTML.slice(1);
        };
    // Some IEs don't preserve tabs through innerHTML
    else if (htmlEscape("\t") != "\t")
        htmlEscape = function (str) {
            escapeElement.innerHTML = "";
            escapeElement.appendChild(document.createTextNode(str));
            return escapeElement.innerHTML;
        };
    CodeMirror.htmlEscape = htmlEscape;

    // Used to position the cursor after an undo/redo by finding the
    // last edited character.
    function editEnd(from, to) {
        if (!to) return 0;
        if (!from) return to.length;
        for (var i = from.length, j = to.length; i >= 0 && j >= 0; --i, --j)
            if (from.charAt(i) != to.charAt(j)) break;
        return j + 1;
    }

    function indexOf(collection, elt) {
        if (collection.indexOf) return collection.indexOf(elt);
        for (var i = 0, e = collection.length; i < e; ++i)
            if (collection[i] == elt) return i;
        return -1;
    }

    function isWordChar(ch) {
        return /\w/.test(ch) || ch.toUpperCase() != ch.toLowerCase();
    }

    // See if "".split is the broken IE version, if so, provide an
    // alternative way to split lines.
    var splitLines = "\n\nb".split(/\n/).length != 3 ? function (string) {
        var pos = 0, nl, result = [];
        while ((nl = string.indexOf("\n", pos)) > -1) {
            result.push(string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl));
            pos = nl + 1;
        }
        result.push(string.slice(pos));
        return result;
    } : function (string) {
        return string.split(/\r?\n/);
    };
    CodeMirror.splitLines = splitLines;

    var hasSelection = window.getSelection ? function (te) {
        try {
            return te.selectionStart != te.selectionEnd;
        }
        catch (e) {
            return false;
        }
    } : function (te) {
        try {
            var range = te.ownerDocument.selection.createRange();
        }
        catch (e) {
        }
        if (!range || range.parentElement() != te) return false;
        return range.compareEndPoints("StartToEnd", range) != 0;
    };

    CodeMirror.defineMode("null", function () {
        return {
            token: function (stream) {
                stream.skipToEnd();
            }
        };
    });
    CodeMirror.defineMIME("text/plain", "null");

    var keyNames = {
        3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
        19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
        36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
        46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 127: "Delete", 186: ";", 187: "=", 188: ",",
        189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\", 221: "]", 222: "'", 63276: "PageUp",
        63277: "PageDown", 63275: "End", 63273: "Home", 63234: "Left", 63232: "Up", 63235: "Right",
        63233: "Down", 63302: "Insert", 63272: "Delete"
    };
    CodeMirror.keyNames = keyNames;
    (function () {
        // Number keys
        for (var i = 0; i < 10; i++) keyNames[i + 48] = String(i);
        // Alphabetic keys
        for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);
        // Function keys
        for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;
    })();

    return CodeMirror;
})();
